单项选择题
The （）is used to thin the paint, if the paint is thick.
A.thinner B.water C.oil D.varnish
单项选择题 A ship’s bottom is given a coating of （）which contains poison.
单项选择题 Repaint the draft figures, plimsoll marks, ship’s name and port of registry （）.
单项选择题 Varnish gives a clear protection coat to （）.
