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In 1963, five neighbouring brigades with different cropping systems in Yuankiang and Nanhsien, Hunan were chosen for the comparative studies on the relations between the cropping system and the population of the paddy borer, Tryporyza incertulas (Wlk.), in order to look for the most economical and effective tactics and methods of control for this serious pest. The chief results were summarized as follows: 1. Among neighbouring brigades in the same region, a sharp difference in the amount of initial population...

In 1963, five neighbouring brigades with different cropping systems in Yuankiang and Nanhsien, Hunan were chosen for the comparative studies on the relations between the cropping system and the population of the paddy borer, Tryporyza incertulas (Wlk.), in order to look for the most economical and effective tactics and methods of control for this serious pest. The chief results were summarized as follows: 1. Among neighbouring brigades in the same region, a sharp difference in the amount of initial population of the paddy borer is one of the important factors influencing its population and damage in the current year. To destroy almost thoroughly the hibernating larvae of the paddy borer by means of cultural practices on a sufficient scale, not only the damage by the first and second generations could be prevented, but the population and damage of the later generations might also be reduced. On this basis, if it is possible to suppress further the population of the second generation by ploughing and flooding the early rice fields on proper time, the damage made by the later generations might be even more effectively repressed. 2. The degree of borer damage depends upon the combined effect of the degree of coincidence of the vunlerable growth stages of rice and the prevailing period of larval hatching and also the borer population. So far as cultural centrol is concerned, to regulate the growth stages of rice and the repression of borer population should be both utilized as much as possible. 3. The cultivation of double-cropping rice (with two crops on the same fields per year) brings not only advantageous but also disadvantageous effects to the development of the paddy borer. Under the conditions of Yuankiang and Nanhsien, Hunan, certain practices in the cultivation of double-cropping rice might be utilized as a part of the means of paddy borer control. 4. In rice belts with complicated cropping system, early planting of the medium-rice could not only avoid serious borer damage, but might also induce the second generation moths laying more eggs on small areas of late medium-rice or single cropping late rice, thus making it possible to kill more borers with less insecticides and save the burden of chemical control for the following generation. 5. It was suggested that the paddy borer control should be carried on the basis of cultural methods, that is, to supress the borer population and regulate the growth stages of rice by means of cultural practices as much as possible, and then recruited with necessary applications of insecticides.

1963年在湖南沅江及南县选择隣近的种植制不同的五个生产大队,調查对比、分析耕作栽培措施及其他生态因素,与三化螟种羣数量消长及为害程度的关系,探索最經济有效的稻螟防治策略和综合措施。各对比点結果一致証明,在同一地区相距不远的大队間,三化螟发生基数大小的悬殊差別,是决定当年发生数量及为害程度輕重的一个重要因素。在适当的面积(大队)上結合耕作栽培措施相当彻底地消灭三化螟越冬幼虫,不仅可控制第一、二代的为害,且对压低第三、四代的发生量和为害程度也有明显的作用。在此基础上如能进一步结合夏收灭茬連續压低虫源,更可加強对后期螟害的控制。螟害程度决定于水稻最易受害生育期与稻螟盛发期配合的程度和螟虫发生数量的綜合影响。因此,在农业防治方面,結合耕作栽培措施压低虫源及調节水稻生育期并恶化螟虫的生活条件,均应尽可能的利用。扩种双季稻对三化螟的发生为害有有利和不利的两面。在湘北滨湖稻区的情况下,可以結合双季稻的耕作栽培,連續压低虫源作为控制螟害的一項措施。在种植制复杂的稻区,中稻早栽既可避免第三代三化螟的为害,且可促使第二、三代三化螟更多地集中在小面积的迟中稻或单季晚稻上,有利于集中施药歼灭。稻螟的防治策略应以农业防治为基础,結合...

1963年在湖南沅江及南县选择隣近的种植制不同的五个生产大队,調查对比、分析耕作栽培措施及其他生态因素,与三化螟种羣数量消长及为害程度的关系,探索最經济有效的稻螟防治策略和综合措施。各对比点結果一致証明,在同一地区相距不远的大队間,三化螟发生基数大小的悬殊差別,是决定当年发生数量及为害程度輕重的一个重要因素。在适当的面积(大队)上結合耕作栽培措施相当彻底地消灭三化螟越冬幼虫,不仅可控制第一、二代的为害,且对压低第三、四代的发生量和为害程度也有明显的作用。在此基础上如能进一步结合夏收灭茬連續压低虫源,更可加強对后期螟害的控制。螟害程度决定于水稻最易受害生育期与稻螟盛发期配合的程度和螟虫发生数量的綜合影响。因此,在农业防治方面,結合耕作栽培措施压低虫源及調节水稻生育期并恶化螟虫的生活条件,均应尽可能的利用。扩种双季稻对三化螟的发生为害有有利和不利的两面。在湘北滨湖稻区的情况下,可以結合双季稻的耕作栽培,連續压低虫源作为控制螟害的一項措施。在种植制复杂的稻区,中稻早栽既可避免第三代三化螟的为害,且可促使第二、三代三化螟更多地集中在小面积的迟中稻或单季晚稻上,有利于集中施药歼灭。稻螟的防治策略应以农业防治为基础,結合重点药治。在种植制复杂的稻区建議采取結合耕作栽培連續压低虫源、調节水稻生育期及恶化螟虫生活条件的各項措施并药治二代桥梁田,对三、四代进行重点药治。

Six species of stem-borers injurious to rice plant have been hitherto known from China. The paddy borer, Tryporyza incertulas (Walker), does the greatest damage and is distributed in the principal rice area in Central and South China. The main factors influencing the fluctuation of population include climate, food, cropping system and biotic factors, among which rice as a food plant and its cropping system play a more marked role. In has been proven that the infestation, survival, reproduction and the degree...

Six species of stem-borers injurious to rice plant have been hitherto known from China. The paddy borer, Tryporyza incertulas (Walker), does the greatest damage and is distributed in the principal rice area in Central and South China. The main factors influencing the fluctuation of population include climate, food, cropping system and biotic factors, among which rice as a food plant and its cropping system play a more marked role. In has been proven that the infestation, survival, reproduction and the degree of damage done are closely related to the growth stages of rice. The tillering and booting stages are advantageous to this pest, while the seedling, transplanting to rejuvenating, prebooting, and ripening stages are disadvantageous. The initial population and living conditions of the paddy borer have a very profound in- fluence on the subsequent changes of the population, and both of which are affected by the cropping system of rice. The size of initial population is determined by the effective pest sources in spring, and has a close bearing on the population size of the current year, especially the first and the second generations. The degree of borer damage depends upon the growth stage of rice plants during the prevailing period of larval hatching and also the population size of the borers. In different regions, it is necessary to utilize as much as possible the cultural practices to eliminate the sources of infestation, repress the initial population and prevent the epidemic of the later generations. Moreover, it is important also to improve cultural practices, regulate the growth stage of rice and deteriorate the living conditions of the paddy borer in order to avoid or reduce borer injury. Chemical control plays also an important role in paddy borer control. The insecticide commonly used now is 6% γ BHC. The effective dosage is 1.5 carries~* per mow to prevent dead hearts and 2 catties each mow in preventing white heads. The essential methods used to apply BHC for borer control are splashing and toxic-earth-casting, both of which are equally effective for the prevention of dead hearts. Although splashing is less satisfactory in preventing white heads, but due to its higher efficiency it is also adopted. As to the proper time of applicaton, during the prevailing period of larval hatching, rice plants at tillering or booting stages should be carefully protected. However, if the borer damage is less than 1% according to forecasting, the application of insecticides will be unnecessary. For the prevention of dead hearts, the proper time of application is 1-2 days before the hatching peak under normal conditions. In an outbreak year, nevertheless, insecticides should be applied at the beginning of the peak. In order to prevent white heads, the booting as well as the early heading stages are recommended as the right time for BHC application. When the booting stage of the rice plant occurs before the hatching peak, the insecticide is usually applied at the beginning of the peak; while the hatching peak happens before the booting stage, application should be done at the beginning of booting. The paddy borer is the chief pest of rice in China, causing an annual loss not less than 10% in average years before liberation. Since the founding of New China, significant advances have been made in scientific research work. The paddy borer control work have been Carried out under the guidance of the policy of plant protection "to promote prevention and elimination simultaneously, with prevention playing the leading role". And the proper tactics of control "to carry on systematic control with cultural control as the basis and recruiting with necessary applications of insecticides", effective control measures and methods of prognosis have been adopted. The control campaign are carried on as mass movements. Therefore, the borer damage has been practically kept in check. In 1963, the average damage due to riceborers was reduced to around 29%, and in many localities even below 1%. All these were achieved by the cooperation among the leading cadres, techanical personnel and masses, under the light of the three red banners of the general line, the big leap forward and the people's communes.

在中国为害水稻較重的螟虫已知有6种,以三化螟 Tryporyza incertulas (Wlk.)最为重要,分布于我国中南部稻区。本文阐述了气候、食料、水稻栽培制度和生物等因素对三化螟种群数量变动的影响,并指出作为螟虫食料的水稻及其栽培制度的作用更为明显。研究証明,三化螟的产卵、侵入、成活、繁殖和为害都与水稻的生育期有密切关系,水稻的分蘖期及孕穗期,都是水稻最易受害的生育期,在这两个时期被害,会造成枯心或白穗;而秧田期、移植至回青期、圓稈期和成熟期都对螟虫不利。螟虫的发生基数和生活环境条件,密切影响种群数量的变动,而这些都受水稻栽培制度的影响。发生基数决定于春季螟虫的有效虫源,其数量的大小对当年的螟虫,尤其对第一、二代的发生量有密切关系。螟害程度主要决定于:(1)种群数量和(2)水稻最易受害的生育期与螟虫盛发期配合程度的综合作用。为了加強防治,各地区必须因地制宜,利用耕作栽培措施,一方面尽可能消灭虫源、压低发生基数、控制以后各代螟虫的发生;另一方面力求改进栽培技术、調节水稻生育期,恶化螟虫的生活条件,避免或減輕螟害。化学防治也是治螟的一項重要措施。目前广泛应用的药剂是6%丙体六六六,每亩用量在防治枯心时为1...

在中国为害水稻較重的螟虫已知有6种,以三化螟 Tryporyza incertulas (Wlk.)最为重要,分布于我国中南部稻区。本文阐述了气候、食料、水稻栽培制度和生物等因素对三化螟种群数量变动的影响,并指出作为螟虫食料的水稻及其栽培制度的作用更为明显。研究証明,三化螟的产卵、侵入、成活、繁殖和为害都与水稻的生育期有密切关系,水稻的分蘖期及孕穗期,都是水稻最易受害的生育期,在这两个时期被害,会造成枯心或白穗;而秧田期、移植至回青期、圓稈期和成熟期都对螟虫不利。螟虫的发生基数和生活环境条件,密切影响种群数量的变动,而这些都受水稻栽培制度的影响。发生基数决定于春季螟虫的有效虫源,其数量的大小对当年的螟虫,尤其对第一、二代的发生量有密切关系。螟害程度主要决定于:(1)种群数量和(2)水稻最易受害的生育期与螟虫盛发期配合程度的综合作用。为了加強防治,各地区必须因地制宜,利用耕作栽培措施,一方面尽可能消灭虫源、压低发生基数、控制以后各代螟虫的发生;另一方面力求改进栽培技术、調节水稻生育期,恶化螟虫的生活条件,避免或減輕螟害。化学防治也是治螟的一項重要措施。目前广泛应用的药剂是6%丙体六六六,每亩用量在防治枯心时为1.5斤,防治白穗为2斤。主要的施药方法为泼浇和撒毒土,两者对防治枯心的效果都很好;撒毒土防治白穗的效果虽稍差,但操作簡便易行。在螟虫发生期內,适值分蘖和孕穗的水稻田一般都要施药;但預测螟害低于1%的田块,可不防治。防治枯心的施药适期一般在孵化高峯前1—2天天开始,如虫量很大,要提前到盛孵始期用药。防治白穗的施药适期是:在蚁螟盛孵前孕穗的水稻,普通在盛孵始期开始施药;蚁螟盛孵后孕穗的水稻,在孕穗始期开始用药。稻螟是我国长期以来的一种严重害虫,解放前因螟害常年損失稻谷10%以上。解放后,在党和政府的領导下,科学技术有了显著的进展,治螟工作貫彻了“防治并举、以防为主”的方針,“以农业防治为基础,重点使用药剂綜合防治”的策略;采用了准确的預测預报;开展了群众性的防治活动,基本上控制了螟虫的危害,1663年的螟害率已压低到2%左右,不少地区已降低到1%以下。这都是在总路线、大跃进、人民公社三面紅旗光輝照耀下,領导、技术人員、群众三結合所取得的成果的

1. Various morphs of susceptible cotton aphids from Yenching Hsien were foundto have different natural resistance to systox by topical application of acetone solution.The LD_(50) for the fundatrigeniae was about 4 times higher than that for the alate alieni-colae. 2. Various morphs of resistant cotton aphids from Peking were also found to havestrongly different resistance to systox. LD_(50)'s for them were detected as follows: in springand summer, fundatrices, 0.0921 μg, fundatrigeniae, 0.0328μg, apterous alienicolae,0.0182...

1. Various morphs of susceptible cotton aphids from Yenching Hsien were foundto have different natural resistance to systox by topical application of acetone solution.The LD_(50) for the fundatrigeniae was about 4 times higher than that for the alate alieni-colae. 2. Various morphs of resistant cotton aphids from Peking were also found to havestrongly different resistance to systox. LD_(50)'s for them were detected as follows: in springand summer, fundatrices, 0.0921 μg, fundatrigeniae, 0.0328μg, apterous alienicolae,0.0182 μg, migrantes, 0.00269 μg. per aphid; in autumn, apterous alienicolae, 0.234 μg,oviparous females, 0.206 μg, sexuparae, 0.11 μg, males, 0.0989 μg per aphid. Thus theLD_(50) for fundatrices was about 34 times higher than that for the migrantes. The differ-ences among various morphs of highly resistant strain from Gaomi Hsien were more orless similar to that from Peking. 3. Differences were found between the alate and the apterous forms of manymorphs, generally, the alate ones had a low degree of resistance to systox. 4. The migrantes, the alate and the apterous alienicolae were found to be the moresusceptible morphs, and it was found that the susceptibility of these morphs might showthe major difference of systox-resistance of locality strains. 5. Tolerance for systox did not vary much among populations of cotton aphids livingon different host plants of the same locality.

1.从来没有使用过有机磷制剂治蚜的延庆地区的棉蚜各型对E-1059最敏感。但棉蚜各型对E-1059有自然抗性的差异。以LD_(50)对比,干雌与有翅侨蚜间的抗性差异为3.82:1。 2.北京东郊棉区自1956年使用E-1059治蚜,棉蚜对E-1059有较低的抗性。但各型对E-1059的抗性很不相同,其LD_(50)如下:在上半年,干母,0.0921微克/蚜,干雌,0.0328微克/蚜,迁移蚜,0.00269微克/蚜;下半年,无翅侨蚜,0.234微克/蚜,产卵雌蚜,0.206微克/蚜,性母,0.11微克/蚜,雄蚜,0.0989微克/蚜。因此,干母与迁移蚜间的抗性差异为34.28:1。 山东高密棉区的棉蚜对E-1059的抗性虽然最强,但是棉蚜各型对E-1059的抗性次序却大体上与北京东郊棉区一致。 3.同一蚜型中,有翅蚜与无翅蚜对E-1059的抗性各不相同,一般有翅蚜抗性低,无翅蚜有较高的抗性。 4.棉蚜各型中,以迁移蚜、有翅侨蚜和无翅侨蚜对E-1059依次最敏感,用以作为抗性测定材料,常可表现出地区间抗性的最大差异。 5.棉蚜各型对E-1059抗性的寄主间差异常不显著。 文末还对棉蚜各型的抗性差异在抗性测定和防...

1.从来没有使用过有机磷制剂治蚜的延庆地区的棉蚜各型对E-1059最敏感。但棉蚜各型对E-1059有自然抗性的差异。以LD_(50)对比,干雌与有翅侨蚜间的抗性差异为3.82:1。 2.北京东郊棉区自1956年使用E-1059治蚜,棉蚜对E-1059有较低的抗性。但各型对E-1059的抗性很不相同,其LD_(50)如下:在上半年,干母,0.0921微克/蚜,干雌,0.0328微克/蚜,迁移蚜,0.00269微克/蚜;下半年,无翅侨蚜,0.234微克/蚜,产卵雌蚜,0.206微克/蚜,性母,0.11微克/蚜,雄蚜,0.0989微克/蚜。因此,干母与迁移蚜间的抗性差异为34.28:1。 山东高密棉区的棉蚜对E-1059的抗性虽然最强,但是棉蚜各型对E-1059的抗性次序却大体上与北京东郊棉区一致。 3.同一蚜型中,有翅蚜与无翅蚜对E-1059的抗性各不相同,一般有翅蚜抗性低,无翅蚜有较高的抗性。 4.棉蚜各型中,以迁移蚜、有翅侨蚜和无翅侨蚜对E-1059依次最敏感,用以作为抗性测定材料,常可表现出地区间抗性的最大差异。 5.棉蚜各型对E-1059抗性的寄主间差异常不显著。 文末还对棉蚜各型的抗性差异在抗性测定和防治工作上的应用、棉蚜对E-1059抗性的消长、棉蚜抗性、指数的初步估计方法和治蚜策略等问题作了讨论。

 
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