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【多选题】
在各种机械传动中,常用一系列的齿轮来达到传动目的,这一系列的齿轮称为轮系,轮系可分为( )。A.
轮系
B.
轮系
C.
周转轮系
D.
行星轮系
E.
差动轮系
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举一反三
【单选题】He spoke very fast and very _____ people understood what he said. [ ]
A.
little
B.
a little
C.
few
D.
a few
【单选题】If someone sends a message the size of one gigabyte, ______.
A.
it is large
B.
it is very small
C.
it takes little time for a computer to read
D.
it is the size of a short note
【单选题】Never before _____ so highly successful in his attempts to change the weather slightly on a very small scale. [ ]
A.
man has been
B.
man is
C.
will man be
D.
has man been
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