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相对视力
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     THE STUDY OF RELATIVE COULOMETRIC TITRITION
     相对库仑滴定法
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     Conclusions The visual progn osis of the elder sen ile cataract is relatively poor.
     结论高龄老年性白内障的视力预后相对较差。
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     Theory of Relativity & Theory of Relative Absoluteness
     相对绝对论
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     Her Vision Was Tied Down
     视力受限
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     Good Sight
     好视力
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  apparent visual
We therefore consider that this apparent visual perspective taking ability does not necessarily imply any ability to understand knowledge states.
      
On the apparent visual forms of relativistically moving objects
      
The question of the apparent visual shape of an object moving at relativistic speeds, as perceived by a single observer, is analysed afresh.
      
Analytical formulae relating the apparent visual shape to the shape at rest are given.
      
Effects of gaze on apparent visual responses of frontal cortex neurons
      
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AIM To investigate the characteristics of poor eyesight and eyesight status of adolescents in urban key middle school and rural ordinary one in Shantou city. METHODS ① Totally 3 490 adolescents in 2003 from grade 7 to grade 12 in some urban key middle school and some rural ordinary middle school in Shantou were recruited . There were 1 866 adolescents in some urban key middle school among which 1 017 adolescents were boys and 849 were girls. 287 were from grade 7 386 from grade 8 408 from grade 9 238 from...

AIM To investigate the characteristics of poor eyesight and eyesight status of adolescents in urban key middle school and rural ordinary one in Shantou city. METHODS ① Totally 3 490 adolescents in 2003 from grade 7 to grade 12 in some urban key middle school and some rural ordinary middle school in Shantou were recruited . There were 1 866 adolescents in some urban key middle school among which 1 017 adolescents were boys and 849 were girls. 287 were from grade 7 386 from grade 8 408 from grade 9 238 from grade 10 226 from grade 11 242 from grade 12. There were 1 624 adolescents in some rural ordinary middle school among which 996 adolescents were boys and 628 were girls. 340 were from grade 7 310 from grade 8 286 from grade 9 232 from grade 10 236 from grade 11 220 from grade 12. ②The investigation was conducted in two middle schools from May to June 2003. Eyesight test was performed according to the eyesight test method introduced by manual of "Investigation and Study on China Adolescent Health"with eyesight test instrument stated by China. Naked eyesight ≤ 4.9 was set as poor eyesight naked eyesight ≥1.0 was set as normal . The level of poor eyesight 4.9-4.8 was slight  4.7 -4.6 was moderate and ≤ 4.5 was severe. Corresponding comparison of eyesight was performed for different grades. Questionnaires were handed out to the adolescents in the grade 12 in the two middle schools. Time for the incidence of poor eyesight duration of eye-using daily sanitation and habit for eye-using time of outside movement status of nutrition family economics learning environment educational level of the parents as well as the status of poor eyesight and so on were investigated. ③ Analysis of variance was used for difference comparison of data materials . RESULTS Totally 3 490 adolescents entered result analysis and completed investigation. ① Rate of poor eyesight Rate of poor eyesight in the urban key middle school in Shantou was significantly higher that in the rural ordinary middle school 74.17% vs 41.26% P < 0.01. ② Incidence of poor eyesight in different grades the rate of poor eyesight of different grades was increased with the increase of the grade in the two middle schools. Rate of poor eyesight of each grade in the urban key middle school was all higher than that in some rural ordinary middle school P < 0.01.③Level of poor eyesight of the adolescents in grade 12 in urban and rural middle schools 92.5% of adolescents in the urban middle school had moderate and severe poor eyesight 67.5% of adolescents in the rural middle school had moderate and slight poor eyesight. ④Population distribution of poor eye sight-initiating of the adolescents of grade 12 in urban and rural middle school The rate of poor eyesight since primary school in the urban middle school was higher than that in the rural middle school. There was one obvious burst period of poor eyesight from grade 5 to grade 7 and the rate of poor eyesight reached 62.29% till grade 7. Relative increased poor eyesight appeared in the grade 6 in rural middle school but then increased gradually. The rate of poor eyesight was 20.59% in the grade 7 which was obviously lower than that of the urban adolescents. CONCLUSION ①The incidence of poor eyesight of the adolescents in urban key middle school was severer than that in the rural middle school in Shantou city. ② The level of poor eyesight of different grades in the two schools is increased with the increase of grade and the incidence of poor eyesight of each grade in urban middle school is severer than that in the rural middle school. ③Moderate and severe poor eyesight appeare in the urban middle school  while slight and moderate poor eyesight in the rural middle school. ④The incidence of poor eyesight since primary school in the urban area is severer than that in the rural middle school  there is an obvious burst period of poor eyesight from grade 5 to grade 7 . In the rural middle school there is relative increased poor eyesight in the grade 6 but then increased gradually and till grade 7 the eyesight is better than that in the urban middle school.

目的:了解市区重点中学和农村普通中学学生视力状况及视力低下发生的特点。方法:①选择2003年汕头市区某重点中学及某农村普通中学初一至高三年级在校学生3490人。市区某重点中学学生1866人,其中男生1017人,女生849人。初一287人,初二386人,初三408人,高一238人,高二226人,高三242人。某农村普通中学学生1624人,其中男生996人,女生628人。初一340人,初二310人,初三286人,高一232人,高二236人,高三220人。②调查于2003-05/06在2所中学完成。采用国家规定的视力检测仪器,按《中国学生体质健康调查研究》手册中视力检查方法要求进行视力检测,视力低下判断以裸眼视力≤4.9为视力低下,视力1.0以上为正常。视力低下程度:4.9~4.8为轻度,4.7~4.6为中度,4.5以下为重度。对不同年级视力低下情况作相应比较。分别在两所学校高三级学生分发调查表,重点调查发生视力低下时间、每日用眼时间、用眼卫生习惯、户外活动时间、营养状况、家庭经济、学习环境、家长文化程度及视力低下情况等。③计数资料差异比较采用χ2检验。结果:学生3490人均进入结果分析并完成调查。①视力低下率:汕...

目的:了解市区重点中学和农村普通中学学生视力状况及视力低下发生的特点。方法:①选择2003年汕头市区某重点中学及某农村普通中学初一至高三年级在校学生3490人。市区某重点中学学生1866人,其中男生1017人,女生849人。初一287人,初二386人,初三408人,高一238人,高二226人,高三242人。某农村普通中学学生1624人,其中男生996人,女生628人。初一340人,初二310人,初三286人,高一232人,高二236人,高三220人。②调查于2003-05/06在2所中学完成。采用国家规定的视力检测仪器,按《中国学生体质健康调查研究》手册中视力检查方法要求进行视力检测,视力低下判断以裸眼视力≤4.9为视力低下,视力1.0以上为正常。视力低下程度:4.9~4.8为轻度,4.7~4.6为中度,4.5以下为重度。对不同年级视力低下情况作相应比较。分别在两所学校高三级学生分发调查表,重点调查发生视力低下时间、每日用眼时间、用眼卫生习惯、户外活动时间、营养状况、家庭经济、学习环境、家长文化程度及视力低下情况等。③计数资料差异比较采用χ2检验。结果:学生3490人均进入结果分析并完成调查。①视力低下率:汕头市区重点中学学生明显高于农村普通中学学生(74.17%,41.26%,P<0.01)。②不同学段视力低下发生情况:两所学校不同学段视力低下率随年级的升高而增高。市区某重点中学各学段视力低下率均高于某农村普通中学(P<0.01)。③城市和农村中学高三级学生视力低下程度:市区中学学生以中重度为主,占92.5%;农村中学学生以低中度为主,占67.5%。④城市和农村中学高三学生初发视力低下时段人数分布:市区中学学生自小学阶段视力低下率就高于农村中学,五年级至初一时段有一明显的视力低下突增期,至初一时视力低下率已达62.29%。农村中学在六年级时有相对视力低下增加,但以后呈稳步上升。至初一时视力低下率20.59%,明显低于市区中学学生(P<0.01)。结论:①汕头市区重点中学学生视力低下发生情况较农村中学学生严重。②两所学校不同学段视力低下率随年级的升高而增高,且市区中学各学段视力低下发生情况较农村中学学生严重。③市区中学学生以中重度为主,农村中学学生以低中度为主。④市区中学学生自小学阶段视力低下发生情况较农村中学严重,五年级至初一时段有一明显的视力低下突增期。农村中学在六年级时有相对视力低下增加,但以后呈稳步上升,至初一时视力低下发生情况较市区中学学生好。

 
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