Dry chemical or foam
Foam or soda acid
carbon dioxide or foam
carbon dioxide or dry chemical
第1题：
Which statement concerning the application of dry chemical powder is FALSE ________．
A.At temperatures of less than 32℉，the extinguisher must be recharged more often
B.When possible，the fire should be attacked from windward
C.The stream should be directed at the base of the fire
D.Directing the stream into burning flammable liquid may cause splashing
第2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3题：
What type of extinguisher should be used for an electric fire? ________
A.CO2
B.Form
C.Water
D.Water and Form
第4题：
The foam extinguisher should be used （）.
第5题：
An advantage of a dry chemical over a carbon dioxide fire extinguisher is its ______.
A.greater range
B.effectiveness on all types of fires
C.cleanliness
D.All of the above
第6题：
______, as the chemical extinguisher agent, should be used for an electric fire.
A.dry chemical or foam
B.foam or soda acid
C.carbon dioxide or foam
D.carbon dioxide or dry chemical
第7题：
An ABC dry chemical fire extinguisher would be LEAST effective against a fire in ______.
A.a mattress
B.spilled liquids such as oil or paint
C.high voltage electrical gear
D.a trash can
第8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9题：
This fire extinguisher is to be used only in case of（）.
Aurgency
Bemergency
Cimmediacy
Dcrisis
第10题：
化学杂交剂（Chemical Hybridizing Agent，CHA）