contains 15 pounds of CO2
weighs 15 pounds when full of CO2
has 15 pounds of pressure at the nozzle
weighs 15 pounds when empty
第1题：
A carbon dioxide fire extinguisher should be recharged ______.
A.at least annually
B.whenever it is below its required weight
C.only if the extinguisher has been used
D.before every safety inspection
第2题：
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
第3题：
Which of the following is (are)an advantage of a dry chemical extinguisher over a carbon dioxide extinguisher？The dry chemical extinguisher：Ⅰ．Has a greater range．Ⅱ．Provides a heat shield for the operator．
A.Ⅰonly
B.Ⅱonly
C.Both Ⅰand Ⅱ
D.Neither Ⅰ nor Ⅱ
第4题：
At each drill a different person should be in （）(负责)of an extinguisher.
第5题：
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
第6题：
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
第7题：
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
第8题：
If you are unable to stop a diesel engine by any other means，you should ______．
A.Discharge a CO2 extinguisher in the air inlet
B.Pull off the distributor cap
C.Secure the jacket water
D.Secure the starting air supply valve
第9题：
This fire extinguisher is to be used only in case of（）.
Aurgency
Bemergency
Cimmediacy
Dcrisis
第10题：
（）is best for electrical fire.