安全规程规定,井下作业地点空气含尘量不得超过()mg/l。
A.2
B.0.5
C.5
参考答案:A
Sarah, it is high time that you_______; or you won’t have time to______ before the party.
A.got up; get changed
B.get up; get changed
C.will get up; get changing
D.should get up; get to change
施工前,应设置临时设施和材料的堆放场地,以确保运输、()通路的畅通。
A.物资
B.施工
C.基建
D.消防