皮皮学，免费搜题
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【多选题】
过筛时应遵循下列原则( )
A.
在振动时使物料通过筛网
B.
粉末宜干燥
C.
粉末不宜过多
D.
粉末不宜过少
E.
过筛后进一步搅拌混合
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【单选题】Their plan to be a perfect one.
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