你可能感興趣的試題

單項(xiàng)選擇題

The principle protective coating is （）.

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

單項(xiàng)選擇題

（）are the three different coatings which can protect metal from corrosion.

A. Cement wash, bitumen and paint
B. Metal primers, undercoats and topcoats
C. Varnishes, heat-resistant paints and anti-fouling paints
D. Cement wash, primer and undercoat