variable
the same
lighter
heavier
第1题：
An inert gas system on a tanker should be used to ______.
A.prevent the generation of flammable or combustible gas in tanks
B.blow out cargo lines to prevent the build up of gas concentrations
C.dilute tank atmospheres to keep gas concentrations below the lower explosive limit
D.prevent fires in the pumproom by continually displacing flammable vapors
第2题：
Certificate of Fitness for the Carriage of Liquefied Gases in Bulk shall be carried on board by ______．
A.gas carriers constructed on or after 1 July 1986
B.gas carriers constructed before 1 July 1986
C.All chemical tankers
D.oil tankers of 150 gross tonnage and above
第3题：
A、Liquefied NG Gas
B、Liquefied Natural Gas
C、Liteer Natural Gas
D、Liquified Night Gas
第4题：
Which instrument is suitable for determining the presence of explosive concentrations of fuel oil vapors in tanks ________．
A.A flame safety lamp
B.A combustible gas indicator
C.A liquid cargo meter
D.All of the above
第5题：
The vapor pressure of a gas is the pressure necessary to keep it in a（n）______．
A.Soluble state
B.Solid state
C.Liquefied state
D.Inert state
第6题：
How does an inert gas system on a tanker function to prevent explosions in cargo tanks?
A.De-energizes the "charged mist" effect
B.Maintains a positive pressure on the vent header to cool the flammable vapors
C.Inert gas filters out the flammable vapors from the cargo tank spaces
D.Inert gas dilutes the flammable vapor and air concentrations to keep them below the lower explosive limit
第7题：
The primary hazard of liquefied petroleum gas and liquefied natural gas is ______．
A.Pressure
B.Toxicity
C.Temperature
D.Flammability
第8题：
Gas Carriers are generally referred to the cargo ships constructed or adapted and used for the carriage of ________ ．
A.LNG in bulk
B.LNG ＆ LPG in bulk
C.LPG in bulk
D.LNG ＆ LPG and other liquefied gas products
第9题：
One of the principal dangers inherent in liquefied petroleum gas is ______．
A.As it warms up it becomes heavier than air
B.The way it reacts with sea water
C.The strong odor it produces
D.Its low temperature causes frostbite or freezing
第10题：
The engine in a covered lifeboat is fueled with ______．
A.Kerosene
B.Unleaded gasoline
C.Diesel oil
D.Liquefied gas