单项选择题

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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单项选择题

A.at the lowest point
B.near the batteries
C.at the highest point
D.only when charging is in progress

单项选择题

A.take part
B.watch
C.go to their quarters
D.stay out of the way and do what they want

单项选择题

A.obliged
B.obliging
C.oblige
D.being obliged