题目内容

按用电设备所处的位置，城轨交通的用电负荷可分为和。

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在一级、二级和三级负荷中，哪一级是最高级？____

三级负荷包括了排烟/排风风机、污水泵、直升电梯、自动扶梯。( )

A. 对
B. 错

When he is coming ______ very important.

A. seem
B. seems
C. are
D. have

The teacher, together with his students, _____ planting trees in the street.

A. have
B. are
C. has
D. is