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【单选题】
在图示轮系中，已知各轮的齿数为Z1= 20， Z2=30，Z3=80， Z４=25，Z5=50，则传动比【图片】为（ ）【图片】A.
6
B.
-6
C.
10
D.
-10
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举一反三
【单选题】You can come ______ on Tuesday _______ on Friday, but whichever you choose, please let me know.
A.
not only; but also
B.
both; and
C.
neither; nor
D.
either; or
【单选题】Please make sure the regulations about how to______the Customs before you choose the channel.
A.
pass through
B.
pass by
C.
pass over
D.
pass away
【单选题】Please choose the right description about the language of two.
A.
The Language of Two is to divide the world.
B.
The Language of Two is to list, compile and expand.
C.
The Language of Two is to provide the sense of whole.
D.
The Language of Two is to denote the single-mindedness.
【单选题】Please listen carefully and choose the best answer.
A.
They are as loyal as dogs.
B.
They have unusually long tails.
C.
They are fond of sleeping in cabinets.
D.
They know how to please their owners.
【单选题】Now that the sign reads, “No person ______ smoke here”, please choose a seat in the smoking area over there if you _______ smoke.
A.
must; shall
B.
will; must
C.
shall; must
D.
can; should
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