通风机的主要工作参数为（）
A.风量
B.风压
C.功率
D.效率
E.转速
参考答案：A, B, C, D, E
结合自己实际谈谈怎样才能摆脱不良诱惑的干扰，避免不良诱惑的危害。
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So many brand marks _____each other that we had great difficulty finding the one he referred to.
A．resembled to
B．differed from
C．differed
D．resembled
