钻机作()行使,或上、下坡,以及遇到偏低的空中障碍物时,都必须放下滑架。
A.长距离
B.中距离
C.短距离
参考答案:A
Smoking is bad for your health. You'd better _____. [ ]
A. give up it
B. give it up
C. take out it
D. take it out
烘焙法必须用()
A.文火
B.中火
C.先文火后武火
D.武火
E.先武火后文火