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【判断题】
平面汇交力系就是各分力的力线都在同一平面内。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】Miss Li ___as a secretary for five years in the company, and now she is general manager of it.
A.
serves
B.
served
C.
has served
D.
had served
【单选题】Miss Li ___ as a secretary for five years in the company, and now she is general manager of it.
A.
has served
B.
had served
C.
served
D.
serves
【单选题】14-53. Which of the following italicized parts is used as an object complement?
A.
The front door remained locked
B.
The boy looked disappointed .
C.
Nancy appeared worried .
D.
He seemed to have no money left .
【简答题】财政政策对增加均衡国民收入效果较好的条件是什么？
【简答题】交流工频安全电压的上限值,在任何情况下,两导体间或任一导体与地之间都不得超过() V 。
【单选题】Dr Ma, ________ ORBIS doctor, has done so important ________ job that many people are grateful to him. [ ]
A.
a; a
B.
a; an
C.
an; a
D.
an; an
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