A.20MPa
B.30MPa
C.40MPa
D.50MPa
A.20MPa
B.30MPa
C.40MPa
D.50MPa
A.20MPa
B.30MPa
C.40MPa
D.50MPa
A.C30表示28天龄期混凝土的立方体抗压强度特征值为30MPa
B.C30中的“C”代表混凝土
C.30MPa是指混凝土的抗压强度
D.C30表示混凝土的抗折强度为30MPa
A.C25
B.C30
C.C35
D.C40
A.<img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240116/1705384179159545.png">
B.<img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240116/1705384179252547.png">
C.<img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240116/1705384179277809.png">
D.<img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240116/1705384179332868.png">
A.C15
B.C20
C.C25
D.C30
A.标准立方体试件,在7天龄期
B.标准试柱,在28天龄期
C.标准立方体试件,在28天龄期
D.标准立方体试件,在14天龄期
A.C20
B.C23
C.C25
D.C30
A.C15
B.C20
C.C25
D.C30