Primer coats are applied to a bare metal surface to （）protection against rust.

单项选择题Primer coats are applied to a bare metal surface to give protection against （）.

A.rust
B.dirt
C.dust
D.air

单项选择题（）is used in bilges and peak tanks.

A.Bitumen
B.Paint
C.Cement wash
D.Varnish

单项选择题（）is the eye of the ship.

A.Engine room
B.Bridge
C.Deck
D.Compass

单项选择题Cement wash is a mixture of cement powder and （）.

A.fresh water
B.steel
C.paint
D.wood

单项选择题The principle protective coating is （）.

A. cement wash
B. paint
C. bitumen
D. undercoat