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【判断题】

由质地坚硬的含炭黑色硅质粉砂岩加工而成的光滑,平整的长方块体的是试金石。( )

A.
正确
B.
错误
举报
参考答案:
参考解析:
.
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【单选题】砾岩的颗粒直径()mm,砂岩的颗粒直径为()mm,粉砂岩的颗粒直径为()mm。

A.
大于1,0.1~1,0.01~0.1
B.
大于1,0.05~1,0.01~0.05
C.
大于0.1,0.01~0.1,0.001~0.01
D.
大于1.5,0.1~1.5,0.01~0.1