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單項(xiàng)選擇題

（）gives a clear protective coat to woodwork.

A.Varnish
B.White gloss paint
C.Paint
D.Bitumen

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單項(xiàng)選擇題

Bridge decks, cabin doors and hand rails are usually coated with（）.

A. cement wash
B. white gloss paint
C. bitumen
D. varnish

單項(xiàng)選擇題

A （）can give power to hoist or lower the cargo.

A. crane
B. life winch
C. derrick
D. cargo winch

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