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【单选题】
数控机床主轴( )线数一般是1024线
A.
编码器
B.
电机
C.
驱动器
D.
同步轮
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【单选题】Without the air to hold some of the sun’s heat, the earth at night_____very cold, too cold for us to live.
A.
will be
B.
would have been
C.
is
D.
would be
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【单选题】Without the air to hold some of the sun's heat, the earth at night _____,too cold for us to live. [     ]
A.
would be freezing cold
B.
will be freezing cold
C.
would be frozen cold
D.
can freeze coldly
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【单选题】-Some people like hamsters because they sometimes sleep us too much trouble. -That’s why I love to have one in my home. [     ]
A.
all day but give
B.
all the day but give
C.
all day without giving
D.
all day to give
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【单选题】The question is _________ .
A.
so hard for us to understand it
B.
too hard for us to understand it
C.
too hard for us to understand
D.
so hard for us to understand
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【单选题】The medicine has many functions, ______ are unknown to us.
A.
some of which
B.
of which some of them
C.
that some of them
D.
which of them
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【单选题】Without the air to hold some of the sun's heat, the earth at night _____,too cold for us to live. [     ]
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