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【单选题】
中小型立式加工中心常采用()立柱。A.
固定式空心
B.
移动式
C.
旋转式实心
D.
移动式实心
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举一反三
【单选题】With pressure from life and work increasing day by day, there should be something for people to ______. [ ]
A.
make fun of
B.
have fun with
C.
play tricks on
D.
have for fun
【单选题】The humans are destroying nature day by day,__________of course,will cause severe punishment from it sooner or later.
A.
who
B.
when
C.
on which
D.
which
【单选题】The humans are destroying nature day by day,__________of course,will cause severe punishment from it sooner or later.
A.
who
B.
when
C.
on which
D.
Which
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