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?（）<br>A:Hard rubber<br>B:Canvas<br>C:Leather<br>D:Sponge rubber

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

出自：海船船员证

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