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问题
判断题
无极调速时的调速平滑度远小于1。
答案
参考答案:错
选择题
when you want to talk to your teacher ,you should
_ _
first.
A.called to her
B.called up her
C.call her up
D.called her up
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选择题
设P(x,y)是平面直角坐标系中任意一点,定义[OP]=|x|+|y|(其中O为坐标原点).若点M是直线y=x+1上任意一点,则使得[OM]取最小值的点m有( )
A.0个
B.1个
C.2个
D.无数多个
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