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【判断题】
Language has two systems. One is sound system; the other is written system. The two are related to each other.A.
正确
B.
错误
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A.
No, she didn’t
B.
No, she hadn’t
C.
Yes, she does
D.
Yes, she did
【简答题】凸轮机构有哪些类型?分别用在什么场合?
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