人的性格按其倾向性可以划分为内倾型与外倾型两大极端类型。内倾型的基本特点是；心理活

In order to discharge a CO2 portable fire extinguisher, the operator must FIRST ______.

A.invert the CO2 extinguisher

B.squeeze the two trigger handles together

C.remove the locking pin

D.open the discharge valve

After using a CO2 portable extinguisher, it should be ______.

A.put back in service if some CO2 remains

B.hydrostatically tested

C.retagged

D.Recharged

A portable dry chemical fire extinguisher discharges by ______.

A.gravity when the extinguisher is turned upside down

B.pressure from a small CO2 cartridge on the extinguisher

C.air pressure from the hand pump attached to the extinguisher

D.pressure from the reaction when water is mixed with the chemical

How do you operate a portable CO2 fire extinguisher？______.

A.Point the horn down

B.Turn cylinder upside-down

C.Break the rupture disc

D.Pull pin, squeeze grip

Fire prevention during welding or burning aboard any vessel should include _____.

A.posting a fire watch in the immediate area

B.providing an extinguisher which is ready for immediate use

C.requiring the fire watch to remain on post for 30 minutes after the completion of welding or burning

D.All of the above

A.Past

B.Clear

C.Past or clear

D.Past and clear

When fighting a spreading fire resulting from a broken fuel line, you should FIRST _____.

A.look for a CO2 extinguisher

B.use a soda acid extinguisher

C.shut off the fuel supply

D.smother the fire with rags

听力原文：(A) An extinguisher is being used to put out a fire.

(B) A fire extinguisher is hanging on a wall.

(C) The extinguisher is being recharged.

(D) The fire extinguisher is above the sign.

A．

B．

C．

D．

A.foam and water

B.CO2 and dry chemical

C.dry chemical and water

D.foam and CO2