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
单项选择题 In battery charging rooms，ventilation should be provided（）.
单项选择题 If passengers are on board when an abandon ship drill is carried out，they should（）.
单项选择题 I would be very much（）if you could arrange for a radio technician to come on board as soon as possible for my radar repair.
