單項選擇題In order to prevent galvanic corrosion，an aluminum boat must be insulated from the davits and gripes. Which of the following is acceptable as an insulator?（）
A.Hard rubber
B.Canvas
C.Leather
D.Sponge rubber
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A.at the lowest point
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A.take part
B.watch
C.go to their quarters
D.stay out of the way and do what they want
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