单项选择题
（）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
单项选择题 The basic types of paint used on a ship are （）.
单项选择题 We need different kinds of paint for （）areas.
单项选择题 For painting, the surface of a ship’s hull is divided into （）areas.
