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【单选题】
国家标准规定,混凝土立方体抗压强度以立方体试件在标准条件下养护 28d 时测定,该立方体的边长规定为( )A.
200mm × 200mm × 200mm
B.
150mm × 150mm × 150mm
C.
100mm × 100mm × 100mm
D.
50mm × 50mm × 50mm
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