单选题Since accumulations of H2S gas on a ship can be dangerous to personnel，it is important to know that H2S gas is（）.A lighter than airB heavier than airC a yellow gas that is easily recognizedD mildly toxic

can you list some ship’s stores?

The safe operations of a liquified gas can be found in ________ ．

A.International Maritime Dangerous Goods Carried by Sea

B.International Code for the Construction and Equipment of Ships Carrying Gases in Bulk

C.International Convention for the Safety of Life at Sea

D.International Regulations for Preventing Collisions at Sea

Any open flame can’t exist in this business building

A.Yes. We’ve removed all the flammable gas.

B.Yes. We’ve searched everywhere for flammable liquid

C.Yes. All the flammable liquid and gas have been removed already.

D.Yes. We’ve removed all the liquid, gas and wood which can be burned

The Captain ordered the dangerous cargo on deck ______ to lighten the ship and minimize the risk at sea．

A.Be jettisoned

B.Be dropped

C.Be dived

D.Be abandoned

A cargo tank that is initially gas freed，can be inerted by introducing inert gas by a process known as ______.

A.dilution

B.displacement

C.precipitation

D.Either A or B

Keep compartment ______ as the gas given off can be dangerous.

A.in good order

B.well clean

C.well ventilated

D.more room

High concentrations of H2S gas are most dangerous to personnel because they can ______.

A.cause involuntary muscle contractions

B.paralyze your breathing system

C.cause eye inflammation

D.cause dizziness

The captain of a ship can be also called

A.master

B.agent

C.ship owner

D.pilot

Which statement about damage control is TRUE ________．

A.A hole in the hull at the waterline is more dangerous than a hole below the inner bottom

B.The amount of water entering a ship through a hole varies inversely to the area of the hole

C.Water flowing into a lower compartment on a ship is more dangerous than water on deck or flowing into an upper compartment

D.Water flowing over the forecastle bulwark is more dangerous than a hole in the hull at the waterline

Which statement is TRUE concerning inert gas systems on tankers ________．

A.Flue gases from the ship's boilers are used in some systems

B.The gas is helium

C.Using the system accelerates the rusting of the tanks

D.All of the above