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【单选题】
发生穴蚀时，介质与零件表面发生的是（）。A.
生化作用
B.
电化学作用
C.
物理作用
D.
相互作用
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举一反三
【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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