水龙带是井下作业中进行循环施工的重要配件,其一端与水龙头的鹅颈管或活动弯头相连,另一端与()相连.
参考答案:立管或地面管线
It's unusual for ______ so few people in the street.[ ]
A. there is
B. there to be
C. there have
D. there being
交行安全工作体制要求是()
A.行长负责制
B.行员负责制
C.保安负责制
D.押运负责制