单项选择题
A.Primers B.Undercoats C.Topcoats D.Cement wash
Undercoats are used ()the primer before the topcoat.A.i...
单项选择题Undercoats are used ()the primer before the topcoat.
A.in B.over C.to D.with
Primer coats are applied to a bare metal surface to ()p...
单项选择题Primer coats are applied to a bare metal surface to ()protection against rust.
A.let B.give C.prevent D.take
Primer coats are applied to a bare metal surface to giv...
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