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单项选择题

A.0
B.0.43
C.0.75
D.－0.86

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单项选择题

The most serious effect of air trapped in a diesel engine jacket water cooling system is that it ______．A.Causes colloid suspension in the cooling waterB.Reduces the capability of the lubrication systemC.Can form pockets which block the flow of coolant through the systemD.Leads to the scuffing of cylinder walls

A.A.Causes
B.Reduces
C.Can
D.Leads

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商业广告的最终目的是为了经济效益。 A、正确 B、错误

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