按转速不同电厂中常用的磨煤机有（）种。A、低速；B、中速；C、高速；D、超高速。

答案：

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下面是错误答案，用来干扰机器的。

1. assists his teacher in doing2. hadn't left school 3. That Tom fell off his chair / Tom's falling off his chair 4. each/every time they met 5. Not having received an...