For many years,during the government disposal of the emergencies such as convulsion,earthquake,flood,and plague,the principle of administrative emergency experienced the test of practice which makes its theoretical and practical value more important.

The study of this paper is based on the dynamic circumstances and the topic of the study is the executive ability of on-the-spot management of enterprises. The study and discussion about this topic are totally new not only at home but also at abroad. So the research results and conclusions of this paper have inevitably plenty of flaws and the concrete application of these research achievements still need to stand the test of practice.

According to the experiments data,the article gives the connected formula of calculating velocity of entrainment and elutriation,which apply to the design of large prodction facilities and have got the test of practice.

The realization of strategic transformation of the Party's guiding ideology after the 3rd Plenary session of the 11th CPC Congress is closely linked to DENC Xiao-ping's ideas of plactice and scientific methods, and enhanced by the test of practice.

This gives rise to products and development instruments which will stand the test of practice.

Another tenet of the early BPR movement has not stood the test of practice, either.

The naked carp (Gymnocypris przewalskii przewalskii (Kessler) ) is the only fisheryproduct in Qinghai Hu and investigation on the resource of this fish is rarely taken. Thetotal catches for the whole Lake was nearly 140,000 metric tons during the period from1958--1976, but both the size of individuals and the yield per year have decreased. It isstill jn question whether the resource of population has declined or the present fishing ismoderate. The study of population of naked carps was carried out during 1975--1977.The...

The naked carp (Gymnocypris przewalskii przewalskii (Kessler) ) is the only fisheryproduct in Qinghai Hu and investigation on the resource of this fish is rarely taken. Thetotal catches for the whole Lake was nearly 140,000 metric tons during the period from1958--1976, but both the size of individuals and the yield per year have decreased. It isstill jn question whether the resource of population has declined or the present fishing ismoderate. The study of population of naked carps was carried out during 1975--1977.The general status of resource dynamics is investigated by the use of Beverton--Holt's mathmatical model. By analysing the results of catches of naked carp it shows that the total mortalitycoefficient is 0.68; the natual mortality coefficient is 0. 18; and the fishing mortalitycoefficient is 0. 50. The six data (Pn/R, Pw/R, Yn/R, Yw/R, Wy, Ly) are calculatedunder conditions of different fishing mortality coefficient. They are supposed atdifferent initial fished age (tc). The eumetric catches curve is ploted and the maximumbiomass age is estimated. According to actual measurement and calculation results, it is summarized as follows: 1. The naked carp is a stable population of which the status of development of fisheriesagrees with general law of exploited lake. The average length and average weight of fishedindividual in exploited lake declined in general. In the survey of the latest three yearslength and weight show gradually stable without declination any longer. The populationnumber and fishery yield are relatively stable at present, it is considered that the resourcehas not declined. 2. The results of calculation show that under conditions of initial fished age of 10.0and fishing mortality coefficient of 1.25, naked carps have a standing population of50,000 metric tons, its maximum sustained yield is 4,791 metric tons/year. But thepresent yield (4,200 metric tons/year), obtained under conditions of initial fished age of7. 0 and fishing mortality coefficient of 0. 50. If initial fished age being raised to 10 yearsold (i. e. enlarging the mesh size), the catches by weight may be expected to increase by10 per cent, but it still has certain distance to attain maximum, unless both initial fishedage and fishing effort should be increased, the total yield can reach to maximum. In doingso, it is certain to increase the capital of investment, but the yield and the economicaleffect increase only a little. Thus, compared with intensifying fishing effort, whethereconmically or in fish growth, enlarging mesh size seems profitable. Owing to the resultsmentioned above, we consider it is suitable to maintain present mesh size and keep a yieldof 4, 700 metric tons/year. 3. For ensuring recruitment parent spawners, it must be protected on a basis ofregulations and restrictions. 4. Mathmatical model is used for estimation maximum sustained yield of standing fishpopulation in approximation. The subsequent test of practice and further study is needed.

This paper analyses and studies the system model set for the produ-ctive structure of an agricultural system "with the method of system engineering It concisely explains the state of system operation of three years during operation of more than three years the model formula underwent the test of Practice and produced the economic benefit It provided the scient if ic basis of decision for decision makers of Reclamation Region

According to the experiments data,the article gives the connected formula of calculating velocity of entrainment and elutriation,which apply to the design of large prodction facilities and have got the test of practice. The article detailly analyzes and compares about the connected formula and counted figures in references.it will have directive significance to the theoretic study and experiments on this respect.