【判断题】【消耗次数：1】
步进电机转动速度与电脉冲频率成正比，通过改变电脉冲频率就可调节步进电机的转速。
①
正确
②
错误
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don’t they
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didn’t they
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did they
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can
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may
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should have sent
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was going to send
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should send
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dares catches
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dare to catch
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dare catching
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dare catch
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cant
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must; can; must; his
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may; can; must; him
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must; can; him
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were
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