题目内容

负荷下的工作时间是机械的有效工作时间。( )

A. 对
B. 错

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We would not give you any lower price ______ you could place an order for more than 500 tons.

A. except
B. until
C. unless
D. besides

Please ______ us if you find our price competitive.

A. buy them with
B. place orders with
C. place orders from
D. place our orders

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