题目内容

流动式起重机的稳定性就是起重机自重载荷和起吊载荷对倾覆边的力矩之和要()。

A. 等于零
B. 大于零
C. 小于零

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The brown bear escaped from the zoo, which was a________to everyone in the town.

A. harm
B. violence
C. hurt
D. threat

公文主题的表达方式主要是()

A. 议论
B. 叙述
C. 描写
D. 抒情

下颌角截除手术，最易损伤并造成出血的血管是

A. 颈内动脉
B. 颈外动脉
C. 面动脉
D. 眼动脉
E. 颈外静脉

She is one of the top students in her class______she studies very hard

A. because
B. so
C. unless
D. though