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【多选题】
按两构件间相对运动形式的不同,低副又分为 ( )。A.
运动副
B.
转动副
C.
螺旋副
D.
凸轮副
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反馈参考答案：
举一反三
【单选题】You can’t help______commercials every few minutes a program is interrupted to broadcast one advertisement or another.
A.
to see
B.
see
C.
seeing
D.
with seeing
【单选题】The sunspot came into its active stage last year, that happens once every eleven years.
A.
one
B.
it
C.
the one
D.
what
【简答题】Do you know there is an earthquake every thirty seconds in the world? But don’t worry because most of them are so small that they cannot be felt. Only a few hurt people. Many earthquakes happen in Chi...
【简答题】What did Jules Hirsch do in his study?
【单选题】By upsetting the balance of the climax stage, man will ______ the indiscriminate hunting of whales for food.
A.
encourage
B.
support
C.
reduce
D.
prohibit
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