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【多选题】
下列关于选煤厂使用的压滤机的描述,哪些是正确的?A.
压滤机的产品水分与物料性质和设备种类有关。
B.
压滤机种类有：箱式（板框式）、箱式隔膜压滤机和带式压滤机。
C.
快开隔膜式的特点是可以同时拉开几块筛板。
D.
浮选精煤采用隔膜式压滤机脱水时，水分在18%-23%。
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A.
people are getting richer and richer
B.
there will be a small gap between rich and poor
C.
the gap between rich and poor is getting larger and larger
D.
it's time to close up the gap between the rich and poor
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