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【单选题】
步进电动机的旋转速度与( )有关。A.
输入电脉冲的个数
B.
输入电脉冲的频率
C.
输入电脉冲的宽度
D.
输入电脉冲的幅度
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举一反三
【单选题】Peter _____ be really difficult at times even though he's a nice person in general. [ ]
A.
shall
B.
should
C.
can
D.
must
【简答题】Peter and Richard share profits in the ratio of 1:4. If the profitsavailable for appropriation are $ 100,000, they would share profits as follows:A. Peter25,000 ; Richard 75,000 B. Peter20,000 ; Richa...
【单选题】&mdashIt&rsquos no use having ideas only. &mdashDon&rsquot worry. Peter can show you to turn an idea into an act.
A.
how
B.
who
C.
what
D.
where
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