單項(xiàng)選擇題

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

A.let
B.give
C.prevent
D.take

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單項(xiàng)選擇題

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

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

單項(xiàng)選擇題

（）is used in bilges and peak tanks.

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