题目内容
Man cannot go on increasing his number at the present rate. In the (56) 30 years man will face a period of crisis. (57) experts believe that there will be a widespread food (58) Other experts think this is (59) pessimistic (悲观的), and that man can prevent things from (60) worse than they are now. But remember that two thirds of the people in the world are under-nourished or starving now. (61) thing that man can do is to limit the (62) of babies born. The need (63) this is obvious, but it is not (64) to achieve. People have to be 65 to limit their families. In the countries of the population (66) , many people like big families. The parents think that this (67) a bigger income for the family and ensures there will be someone in the family who will look (68) them in old age. Several governments have (69) birth control policies in recent years. (70) them are Japan, China, India and Egypt. In some (71) the results have not been successful. Japan has been an (72) . The Japanese adopted a birth control policy in 1948. People were (73) to limit their families. The birth (74) fell from 34.3 per thousand per year to about 17.0 per year (75) present.
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淬火态合金在15℃时效1h，过饱和固溶体中开始析出沉淀相，如在100℃时做时效处理，经1min即开始析出。要使其在1d内不发生析出，则淬火后应保持在什么温度 (提示：应用Arrhellius速率方程)
Man cannot go on increasing his number at the present rate. In the (56) 30 years man will face a period of crisis. (57) experts believe that there will be a widespread food (58) Other experts think this is (59) pessimistic (悲观的), and that man can prevent things from (60) worse than they are now. But remember that two thirds of the people in the world are under-nourished or starving now. (61) thing that man can do is to limit the (62) of babies born. The need (63) this is obvious, but it is not (64) to achieve. People have to be 65 to limit their families. In the countries of the population (66) , many people like big families. The parents think that this (67) a bigger income for the family and ensures there will be someone in the family who will look (68) them in old age. Several governments have (69) birth control policies in recent years. (70) them are Japan, China, India and Egypt. In some (71) the results have not been successful. Japan has been an (72) . The Japanese adopted a birth control policy in 1948. People were (73) to limit their families. The birth (74) fell from 34.3 per thousand per year to about 17.0 per year (75) present.
简述价值论与数量论货币需求说的比较。
认真阅读“给定资料”，简要回答下面两题。 “给定资料4、5”介绍了科普工作的现状。请概括当前制约我国科普工作的因素。 要求：简明、完整。不超过200字。
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