We can’t hoist （）national flag.

单项选择题The sailors should show the relevant （）by day.

A.ladders
B.flags
C.hands
D.lines

单项选择题You should （）the mooring lines according to the changes of draft.

A.adjusted
B.adjusting
C.adjustment
D.adjust

单项选择题Pay more attention to the rising and falling of （）.

A.tide
B.water
C.sea
D.wave

单项选择题Please tell the duty AB to lower the （）.

A.winch
B.radar
C.gangway
D.pilot ladder

单项选择题When a ship is in port, （）must keep a gangway watch.

A.officers
B.crew members
C.sailors
D.bosun