单项选择题
A.Hard rubber B.Canvas C.Leather D.Sponge rubber
In battery charging rooms，ventilation should be provide...
单项选择题In battery charging rooms，ventilation should be provided（）.
A.at the lowest point B.near the batteries C.at the highest point D.only when charging is in progress
If passengers are on board when an abandon ship drill i...
单项选择题If passengers are on board when an abandon ship drill is carried out，they should（）.
A.take part B.watch C.go to their quarters D.stay out of the way and do what they want
I would be very much（）if you could arrange for a radio ...
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.
A.obliged B.obliging C.oblige D.being obliged
