单项选择题
后张法灌浆用水泥浆的抗压强度不应小于()N/mm2
A.25 B.30 C.40 D.45
A.1% B.3% C.5% D.10%
A.30t B.45t C.60t D.120t
A.45d B.35d C.30d D.25d
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