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【单选题】
带传动中,主动轮圆周速度 v 1 ,从动轮圆周速度 v 2 ,带速 v ,它们之间的关系是 。A.
v 1 = v 2 = v
B.
v 1 > v > v 2
C.
v 1 < v < v 2
D.
v> v 1 > v 2
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【简答题】May I take this to thank you all for coming?
【单选题】听力原文：M: May I take this bock out? I need it to work on my paper for Dr. Smith' s history class. W: I am afraid not. The book has been put on reserve by Dr. Smith. Unless you have his written permissio...
A.
Ask Dr. Smith to alter his decision.
B.
Ask Dr. Smith to call the library.
C.
Get the book directly from Dr. Smith.
D.
Get Dr. Smith's written permission.
【单选题】May I take this______to express my gratitude for your kindness?
A.
opportunity
B.
reality
C.
risk
D.
possibility
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