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【单选题】
原生黏土的特点( )A.
原生粘土颗粒粗大，非常纯净，白度高，能在高温中烧成
B.
原生粘土颗粒粗 小 ，非常纯净，白度高，能在高温中烧成
C.
它比 沉积 土更细腻，可塑性更好
D.
它 常常含有其他矿物质或者有机物杂质
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