单项选择题

在食用菌生产中，为了诱导胞外酶的产生和维持细胞代谢产生的能量，并促进菌丝在培养料中快速生长，通常向培养基中加入适量的（）。
A、尿素
B、葡萄糖
C、蛋白胨
D、果胶

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单项选择题

In the long-run equilibrium of a competitive market with identicalfirms, what is the relationship between price P,marginal cost MC,and average total cost ATC?( )

A．P >MC andP >ATC.
B．P >MC andP =ATC.
C．P =MC andP >ATC.
D．P =MC andP =ATC.

多项选择题

Which of the following are the cases when centrifugal force occurs ____？
A、Purchase fewer good from outside the region, thereby reducing the cost of trade
B、The demand for labor increases
C、manufacturers move from other regions to the local regions, so the profits to the local manufactures decline
D、Reduce the nominal wages paid to workers, hence labor flows