对混凝土拌合物坍落度大于220mm应采用坍落度扩展法测定稠度。
参考答案:对
He is an hour late by now.He last night.
A.must stay up
B.should stay up
C.should have stayed up
D.must have stayed up
原发性肝癌手术切除的禁忌证()
A.并发有肝硬化
B.肿瘤已侵及肝门
C.临床上有明显黄疸、腹水
D.已累及半肝以上
E.合并肿瘤远处转移