单项选择题

A．A
B．B
C．C
D．D

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单项选择题

下列两电池反应的标准电动势分别为E1y和E2y：
则E1y与E2y的关系为：
A、-2E1y=E2y
B、E1y= -E2y
C、E1y= - 1/2 E2y
D、2E1y=E2y

单项选择题

The container revolution has facilitated the development of _______ transport as an international through-transport means with various modes of transport.
A、sea
B、road
C、rail
D、multi-modal