建设工程施工进度控制的经常性工作是( )。
A.协助承包单位实施进度计划B.监督施工进度计划的实施C.组织现场协调会D.按年、季、月编制工程综合计划
参考答案:B
He _______ for ten minutes by the time I got there. [ ]
A. has left
B. left
C. has been away
D. had been away
韶山4改型电力机车排石器距轨面高度()。
A.45~75mm
B.45~80mm
C.50~75mm
D.5O~80mm