题目内容

____ is impossible to finish this job before Wednesday.

A. That
B. This
C. It
D. They

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___ six years since I began to study English.

A. It is
B. I have been
C. There are
D. It was

___ in the room at that time.

A. Someone were
B. Nobody was
C. Who is
D. He are

工业机器人传统上一直采用直流伺服电机，因为它基本可以实现免维护。

A. 对
B. 错

除个别运动精度不高、重负载或有防爆要求的机器人采用液压、气压驱动外，工业机器人多采用交流伺服电机驱动。

A. 对
B. 错