单项选择题
（）gives a clear protective coat to woodwork.
A.Varnish B.White gloss paint C.Paint D.Bitumen
单项选择题 Bridge decks, cabin doors and hand rails are usually coated with（）.
单项选择题 A （）can give power to hoist or lower the cargo.
单项选择题 Excuse me, may I （）your file?
