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【单选题】
霍尔元件的结构很简单，它是由霍尔片、四根引线和壳体组成，其中两根引线加激励电压或电流，称为（ ），另两根引线为霍尔输出引线，称为（ ）。A.
霍尔电极，激励电极
B.
激励电极，霍尔电极
C.
电桥电极，霍尔电极
D.
激励电极，电桥电极
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举一反三
【简答题】The police officer made a _______ to let me know that I should stop and talk to him.
【单选题】Speaker A: Which stop should I get off? Speaker B________________
A.
At the railway station
B.
I don't know
C.
Go ahead
【单选题】—You' re too tired, and you should stop _______ a rest. —I know, but I can't stop ___________. I need money. [ ]
A.
to have ; works
B.
having ; to work
C.
to have; working
D.
having ; working
【简答题】The customs invoice is a document required by the customs in some import countries. It is mainly used as a foundation for customs statistics, taxation and certifying the origin of the goods, su...
【单选题】Elisa usually spends a lot of ti me English.
A.
to study
B.
studying
C.
study
D.
studies
【判断题】All import cargo has to be landed at the customs port and should be removed out customs control without the written permission of the customs authorities.( )
A.
正确
B.
错误
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