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【单选题】
岩体巾的各种结构面，由于成因不同，其形态、特征以及力学性质也不同。根据地质成因，结构面可分为原生结构面、构造结构面以及( )结构面等三种类型。A.
(A) 软弱夹层
B.
(B) 劈理
C.
(C) 次生
D.
(D) 层面
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A.
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for
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【单选题】Φ8@200表示直径为8mm，( )的HRB235级钢筋。
A.
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B.
钢筋间距为200mm
C.
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