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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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【单选题】The cost of this building _________to be over a million.
A.
is estimated
B.
estimates
C.
has estimated
D.
having been estimated
【单选题】The teaching building of our school_____ for many times.
A.
has been added to
B.
has added to
C.
has been added up to
D.
has added up to
【单选题】According to the passage, highway building______.
A.
has quickened
B.
has been discouraged
C.
should be encouraged
D.
has been taxed at a lower rate
【简答题】The building has twelve floors. __________ twelve floors in the building.
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