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单项选择题

如果连续的增加某种生产要素，当总产量达到最大时，边际产量曲线。

A．与横轴相交
B．经过原点
C．与平均产量曲线相交
D．与纵轴相交

问答题

An increasingly popular method nowadays is to strangle traders not with high tariffs, which are easy to spot, but with [填空1], which is not.