单项选择题
Unless such oil tanker carries crude oil which is not suitable for crude oil washing，the oil tanker shall（）the system in accordance with the requirements of that Regulation.
A.operate B.check C.install D.overhaul
单项选择题 The purpose of the deck seal in an inert gas system is to prevent（）.
单项选择题 The purpose of inert gas systems aboard tankers is to（）.
单项选择题 The number or name of a tank barge shall be（）.
