单项选择题
Before operating a non-oceangoing ship greater than 100 gross tons it must have a fixed piping system to discharge oily mixtures ashore. This system must include（）.
A.approved oil-water separating equipment B.a fixed or portable containment system at the shore connection C.a spare pump in case the main pump is inoperative D.at least one outlet accessible from the weather deck
单项选择题 An instrument useful in predicting fog is the（）.
单项选择题 An advantage of nylon rope over manila rope is that nylon rope（）.
单项选择题 All the expenses are（）the ship’s account.
