题目内容

同步发电机的励磁控制系统具有合理分配并联机组间无功功率的作用。

A. 对
B. 错

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有功电流是造成发电机感应电势和端电压幅值差的主要原因。

A. 对
B. 错

无限大母线的电压是恒定值。

A. 对
B. 错

Mr Black took his _____________daughter to the classroom.

A. seven-year
B. seven years
C. seven year
D. seven-year-old

There ____ pencil-box, two books and some flowers on the desk.

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