單項選擇題

Undercoats are used （）the primer before the topcoat.

A.in
B.over
C.to
D.with

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單項選擇題

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

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

單項選擇題

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

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