交流异步电动机采用调压调速，采用转速负反馈闭环系统，可以既保证低速时的机械特性硬度，又保证一定的负载能力。()
船舶的残油、废油列入《危险废物名录》，故应按危险废物管理。()
《中华人民共和国水污染防治法》规定，造成渔业污染事故或者渔业船舶造成水污染事故的，由海事管
Why cant the man tell the woman what the present is？
A. Because the woman may think the present"s too cheap.
Because Ava doesn"t want him to tell anyone.
C. Because he wants to keep it unknown until the party.
D. Because he wants to give the woman a surprise.
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