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【多选题】
下列关于塑料表面打磨粗化的说法中,正确的有
A.
打磨可用手工或机械打磨
B.
塑料表面打磨粗化的目的是增强涂料的附着力
C.
塑料表面打磨粗化可以去除静电
D.
经打磨粗化后的塑料可以直接喷涂面漆
E.
塑料表面打磨粗化操作难度大,不实用
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They don’t like to be friends of the same race.
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A.
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B.
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C.
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D.
以上都是
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【单选题】矿砂船双层底设计得比其他船高的目的是:
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提高船舶重心
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