The sailors are （）the leakage in fire-fighting and life-saving operations.

单项选择题The （）from waterline to the bottom of the ship is called draft.

A.breadth
B.depth
C.width
D.height

单项选择题The （）part of the ship on port is called the port bow.

A.aft
B.forward
C.head
D.bow

单项选择题Because of the （）, we have to keep a sharp lookout.

A. poor visibility
B. good visibility
C. good weather
D. dry weather

单项选择题In the （）weather, we have to open the navigational light.

A.frog
B.foggy
C.forest
D.fox

单项选择题we use （）to carry something.

A. chisel
B. drill
C. handcart
D. hand saw