单项选择题

Upon arrival at the discharging port，the inert gas system is（）.

A.turned on
B.turning on
C.turn on
D.to turn on

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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（）.

A.flammable vapors from entering machinery space
B.flue gas escaping to atmosphere
C.inert gas escaping to atmosphere
D.air entering inert gas system

单项选择题

The purpose of inert gas systems aboard tankers is to（）.

A.allow sufficient oxygen in the tank to sustain life
B.prevent outside air from entering the tank
C.provide more discharge pressure
D.comply with pollution regulations