GBZ1-2002《工业企业卫生设计标准》中,短时间接触容许浓度中的短时间是指()min。
A.60
B.40
C.30
D.15
参考答案:D
— How are you going to meet your aunt at the airport _____ Thursday morning?
— I'm going there _____ my car. [ ]
A. on, in
B. on, by
C. in, by
D. in, in
行进中接近放炮警戒区域时,必须(),听从警戒人员的指挥。