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第1题

一般机电一体化产品设计包括哪几阶段？
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第2题

[ He is only too ready to help others, seldom, ____, refusing them when they turn to him. A.if never B.if ever C.i
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第3题

How much vinegar did you put in the soup?——I’m sorry to say, ____. I forget. A.no B.no one C.nothing D.none
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第4题

[ The weather is too cold ____ March this year.——It was still ____ when I came here years ago. A.for; colder B.in;
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