单项选择题
Bridge decks, cabin doors and hand rails are usually coated with（）.
A. cement wash B. white gloss paint C. bitumen D. varnish
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?
单项选择题 All the cargo wires must be greased （）.
