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【单选题】
混凝土的抗拉强度远小于其抗压强度，一般只有抗压强度的（）。
A.
1/17-1/9
B.
1/18-1/7
C.
1/18-1/9
D.
1/18-1/8
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A.
（ A）6.0×10 - 3
B.
（B）5.0×10 - 3
C.
（C）4.5×10 - 3
D.
（ D）3.0
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