单项选择题
A.centre B.lower C.A+B D.A o rB
We can’t hoist （）national flag.A.cleanB.wornC.beautiful...
单项选择题We can’t hoist （）national flag.
A.clean B.worn C.beautiful D.good
The sailors should show the relevant （）by day.A.ladders...
单项选择题The sailors should show the relevant （）by day.
A.ladders B.flags C.hands D.lines
You should （）the mooring lines according to the changes...
单项选择题You should （）the mooring lines according to the changes of draft.
A.adjusted B.adjusting C.adjustment D.adjust
