单项选择题
What term describes a three-strand rope laid up right- or left-handed（）.
A.Soft-laid B.Hard-laid C.Sennet-laid D.Hawser-laid
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（）.
单项选择题 The three conditions which cause engine shutdown are overspeed，low lube oil pressure，and（）.
