单项选择题
Which is a part of a vessel’s standing rigging（）.
A.Sheet B.Backstay C.Topping lift D.Downhaul
单项选择题 What term describes a three-strand rope laid up right- or left-handed（）.
单项选择题 What is NOT a function of the steam drum of a marine water-tube boiler（）.
单项选择题 To find the cause of a gasoline engine’s failure to start，you should（）.
