混凝土板养护初期,严禁人、畜、车辆通行,在达到设计强度( )后,行人
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A.40%
A.40%
B.50%
B.50%
C.75%
C.75%
D.100%
D.100%
参考答案:
A.40%
A.40%
B.50%
B.50%
C.75%
C.75%
D.100%
D.100%
参考答案: