试题与答案

当采用钢绞线、钢丝、热处理钢筋作预应力钢筋时,混凝土强度等级不宜低于( )。 A.

题型:单项选择题

题目:

当采用钢绞线、钢丝、热处理钢筋作预应力钢筋时,混凝土强度等级不宜低于( )。

A.C30
B.C40
C.C20
D.C10

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B

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