We are living a_____.[ ]
A. still
B. quiet
C. calm
D. silent
答案：C
If you have to jump in the water when abandoning a vessel，your legs should be（）.
A.spread apart as far as possible
B.held as tightly against your chest as possible
C.in a kneeling position
D.extended straight down and crossed at the ankles
终止剂目前所采用的是（）。
A、汽油或污油
B、汽油或柴油
C、污油或柴油
