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Any extinguishing agent used on a Class “C” fire must have w

题目
单选题
Any extinguishing agent used on a Class “C” fire must have which important property? （）
A

Cooling ability

B

Leaves no residue

C

Penetrating power

D

Nonconductivity

参考答案和解析
正确答案： D
解析： 暂无解析
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相似问题和答案

第1题：

All portable fire extinguishers must be capable of being ______.

A.carried by hand to a fire

B.carried or rolled to a fire

C.recharged in the field

D.used on class “B” fire


正确答案：A
所有便携式灭火器必须能够被用手携带到火灾（现场）。

第2题：

单选题
Which extinguishing agent is recommended in the Chemical Data Guide for use on a carbon disulfide fire?（）
A

Alcohol foam

B

Dry chemical

C

Chemical foam

D

Water fog


正确答案： C
解析： 暂无解析

第3题：

One of the limitations of foam as an extinguishing agent is that foam ______.

A.cannot be made with salt water

B.is heavier than oil and sinks below its surface

C.is corrosive and a hazard to fire fighters

D.conducts electricity


正确答案：D
泡沫灭火剂的一个局限性是泡沫导电。

第4题：

单选题
Each hand portable，semi-portable and fixed fire extinguishing unit on a ship must be tested and inspected at least once every（）.
A

six weeks

B

six months

C

twelve months

D

two years


正确答案： A
解析： 暂无解析

第5题：

单选题
On a bulk chemical carrier，water should NOT be used as an extinguishing agent to fight a fire if the water may come into contact with the chemical called（）.
A

acrylic acid

B

benzene

C

oleum

D

vinyl toluene


正确答案： C
解析： 暂无解析

第6题：

--Hi, Johnson, any idea where Susan is!
--It's class time, so she__________ in the classroom now.

A.can be
B.must have been
C.might have been
D.should be

答案：D
解析：
根据语境可知，句意为现在是上课时间，所以她应该是在教室里。should be表示“应该会，想必会”，符合句意。can表推测时一般用于否定句和疑问句中，must／might have done表示对过去的推测，均不符合题意。故选D。

第7题：

单选题
Which extinguishing agent is effective in combating an isoprene fire?（）
A

Dry chemicals

B

CO2

C

Foam

D

All the above


正确答案： A
解析： 暂无解析

第8题：

Halogenated hydrocarbon， Halon in short form，is used on board ship as ________ ．

A.fire-extinguishing medium

B.a standard fire test

C.a non-combustible material

D.a fire main


正确答案：A

第9题：

单选题
A class B fire is most successfully fought by（）.
A

preventing oxygen from reaching the burning material

B

cooling the burning material below its ignition temperature

C

using the extinguishing agent to make the burning material fire-resistant

D

using the extinguishing agent to absorb the heat


正确答案： C
解析： 暂无解析

第10题：

单选题
For which of the listed classes of fire combinations would carbon dioxide be most suitable as the extinguishing agent （）.
A

Class A and class B

B

Class B and class C

C

Class A and class C

D

Class C, class D, and class E


正确答案： B
解析： 暂无解析

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