单项选择题
The external flotation bladder on an immersion suit should be inflated（）.
A.before you enter the water
B.after you enter the water
C.after one hour in the water
D.after you notice that your suit is losing buoyancy
点击查看答案&解析
相关考题
-
单项选择题
The Experimental Lighthouse-buoy has no navigational significance and may be removed at will.The above sentence means（）.
A.It's of no use for navigation and would be removed with notice
B.It's useful in navigation and may be removed without notice
C.It's helpless in navigation and may be removed without notice
D.It's helpful in navigation and may be removed without notice -
单项选择题
The effect of wind on exposed areas of the vessel is most noticeable when（）.
A.backing
B.going slow ahead
C.going full ahead
D.turning -
单项选择题
The diurnal variation of pressure is most noticeable（）.
A.above the polar circles
B.in a low pressure area
C.during periods of low temperatures
D.in the doldrums
