单项选择题

电功率的单位是什么( ) A.
库伦 B.
安培 C.
伏特 D.
瓦特

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单项选择题

According to Ricardo, a country will have a comparative advantage in the product in which its _____________.

A．labor mobility is relatively low.
B．labor productivity is relatively high.
C．labor mobility is relatively high.
D．labor productivity is relatively low.

单项选择题

以下选项中，（）比喻新出现的有一定积淀积累的人事物等推动旧的人事物等的在某方面的发展等情况。

A.长江后浪推前浪

B.任尔东西南北风

C.总把新桃换旧符

D.万紫千红总是春