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【判断题】
外啮合齿轮泵中,轮齿不断进入啮合的一侧的油腔是吸油腔。A.
正确
B.
错误
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【单选题】回答1~5题： According to the writer，the motor vehicle accident happens essentially because of
A.
the driver’s poor drivingtechniques
B.
the driver’s violation ofothers’legal and moral rights
C.
the streetwalkers’carelessness while walking
D.
the street walkers’violationof tra侬c regulations
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