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【判断题】
直齿圆柱齿轮的齿顶指齿顶圆与分度圆之间的径向距离,其计算公式是h=1.2m。A.
正确
B.
错误
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皮皮学刷刷变学霸
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【单选题】We can get a loan from the bank if we can ______ some collateral.
A.
put on
B.
put down
C.
put up
D.
put off
【单选题】The boy promised _______ him more help.
A.
give
B.
to give
C.
that he give
D.
that he gives
【单选题】—Can you tell me _____________? —We are very good friends.
A.
how you get on with Joe
B.
who your best friend is
C.
what you are going to be
D.
what he looks like
【单选题】The boy promised his father____with others any more.
A.
not to fight
B.
to not fight
C.
not fight
D.
no fight
【简答题】Ca[CO3]的矿物名称___________或者___________。
【简答题】引入电压串联负反馈可改善放大电路性能,使增益稳定性 、非线性失真 、通频带 、输入电阻 、输出电阻 。
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