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【单选题】
关于休止角的叙述正确的是
A.
休止角可用来描述微粉的流动性．流动性越大，休止角越大
B.
流动性越好，形成的圆锥越矮
C.
流动性越好，形成的圆锥越高
D.
休止角一般在8001800范围内
E.
休止角大一般流速也快
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