题目内容

发电机失磁故障的原因不包括( )。

A. 转子绕组故障
B. 励磁机故障
C. 转子绕组过负荷
D. 运行人员误操作

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发电机功角δ为( )时,发电机向系统发出无功功率。

A. δ<90°
B. δ=90°
C. δ>90°
D. δ>120°

如果正常运行时向系统输出无功为Q1,失步运行后由系统吸收无功为Q2,则系统出现(Q1+ Q2)的无功缺额。( )

A. 对
B. 错

It was not until 3:00 pm______ the secretary found the missing report.

A) where
B) as
C) that
D) while

The police have not ______the search even if it has lasted for a week.

A) given up
B) broken in
C) taken away
D) brought about