一个单位工程由几个施工单位共同施工时，各施工单位都应以同一单位工程为成本核算对象，都要对此单位工程进行核算
参考答案：错
He commanded that the student _____the classroom before he returned.
A didn't leave B wouldn't leave C not leave D can’t leave
水痘患儿应隔离至( )
A．出疹后5天
B．皮疹部分结痂
C．皮疹全部结痂
D．全部结痂脱落
