搜题
问题   更新时间2023/4/3 12:59:00

后张法孔道灌浆用的水泥浆,所用水泥强度等级和灰浆抗压强度应满足( B )。
A.32.5MPa,20MPa B.42.5MPa,30MPa
C.42.5MPa,42.5MPa D.52.5MPa,30Mpa

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