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判断题:生产的短期概念是指所有的生产要素都来不及改变使用量的时期。

A. 对
B. 错

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边际报酬递减规律是说,当一个要素固定时,随着可变要素的增加,边际产品一开始就递减。

A. 对
B. 错

规模报酬递减表明,当企业规模扩大时,产量反而减少,因此是规模不经济的。

A. 对
B. 错

Fill in the blanks with the words given below. Change the form where necessary. Each word can be used only once.adoptfocustransformregulatetypical1. It is difficult to conclude what a(n)____________ student does in his spare time because every student has different interests.2. Some of your suggestions have been ___________, but others have been turned down as they are not workable.3. When you do yoga, try to __________ your breathing. Don't breathe too fast and make sure you breathe only through your nose.4. All of a sudden, he lost his interest in engineering, and _______________ his attention on learning a foreign language.5. People are beginning to realize that to _______________ nature at will is the biggest mistake that man has ever made.

(单项选择)规范规定桥梁静载试验主要控制测点的相对残余变形(或应变)不宜大于( )。

A. 10%
B. 15%
C. 20%
D. 25%

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