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What is the normal length of anchor cable used to anchor a vessel?（）

A.An amount equal to the depth of the water
B.Two times the depth of water
C.Three to four times the depth of water
D.Five to seven times the depth of water

單項(xiàng)選擇題

What is the MOST irritating to the skin?（）

A.Carbon disulfide
B.Ethyl alcohol
C.Isoprene
D.Oleum