混凝土应随拌随用,混凝土运输应采用泵送或混凝土运输车运送,当采用泵送时,输送管路的起始水平段长度不应小于()。
A.10m
B.15m
C.20m
参考答案:B
He never let himself _____.
A.cheating
B.be cheated
C.being cheated
D.to be cheated