采用人工压绳法下管时,()。
A.地桩要牢固
B.沟边坡要稳固
C.在下管沟段不得站人
D.放拉绳人员配备适当,两端溜放速度一致
参考答案:A, B, C, D
Some people haven't realized something as common as _____ to the sun for a long time will do harm to their skin and even cause skin cancer.[ ]
A. exposing
B. being exposed
C. having exposed
D. exposed
工业革命又称产业革命,它最早产生于
A.机械制造业
B.采矿冶炼业
C.交通运输业
D.棉纺织业