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When subjected to high heat from a open flame, or an electri

题目
单选题
When subjected to high heat from a open flame, or an electric heating element, which of the listed refrigerants will break down and produce phosgene gas?（）
A

CO2

B

Methyl chloride

C

R-22

D

Sulphur dioxide

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相似问题和答案

第1题：

When compared to a high-expansion foam，a low-expansion foam will ______．

A.Be dryer

B.Be lighter

C.Be less heat resistant

D.Not cling to vertical surfaces


正确答案：D

第2题：

Heat exhaustion is caused by excessive ______.

A.loss of body temperature

B.loss of water and salt from the body

C.gain in body temperature

D.intake of water when working or exercising


正确答案：B
身体里的水和盐大量丧失导致了热量的损耗。

第3题：

When adding oil to a refrigeration system, precautions must be taken to ensure that

A.the compressor suction pressure is not too high

B.all air is purged from the pump and charging fittings

C.the high pressure cutout switch is held open to prevent accidental starting

D.the condenser is completely shutdown first


正确答案：B

第4题：

单选题
An advantage of aluminum pistons, when compared to cast iron pistons is （）.
A

greater high temperature strength

B

better heat conductivity

C

greater weight per cubic inch

D

increased resistance to wear


正确答案： A
解析： 暂无解析

第5题：

The products described above have been subjected to ( ) treatment of at least SOTlfor 30 minutes.
A. freeze B. cold
C. heat D. wash


答案：C
解析：

第6题：

Flame screens are used to ______.

A.contain flammable fumes

B.protect firefightiers from flames

C.prevent flames from entering tanks

D.keep flame and sparks from getting out of an engine’s exhaust system


正确答案：C
防火网用于防止火星进入舱室。

第7题：

Kapok life jackets should NOT be ______.

A.stowed near open flame or where smoking is permitted

B.used as seats, pillows, or foot rests

C.left on open decks

D.All of the above


正确答案：D
木棉救生衣不应存放在明火附近或允许抽烟的地方，不能当做坐垫，枕头或脚凳，不能遗留在露天甲板。

第8题：

How should cargo tank hatches be protected when the ullage opening is open and the tank NOT gas free?

A.With gooseneck vents

B.With warning signs

C.With flame screens

D.With pressure-vacuum relief valves


正确答案：C

第9题：

共用题干
Heat Is Killer Extremely hot weather is common in many parts of the world.Although hot weather just makes most people feel hot,it can_______(51)serious medical problems-even death.Floods,storms,volcano eruptions and other natural______(52)kill thousands of people every year.
So______(53) extreme heat.Experts say heat may be nature's deadliest killer, Recently,extreme heat was blamed ______(54)killing more than one hundred people in India.It is reported that the total heat of a hot day or several days can______(55)health.Several hot days are considered a heat wave.
Experts say heat waves often become dangerous when the nighttime temperature does not_______(56)much from the highest daytime temperature.This causes great stress on the human body.
Doctors say people can do many things to______(57)themselves from the dangers of extreme heat. Stay out of the sun,if possible.Drink lots of cool water.Wear light colored clothing made______(58) natural materials;avoid wearing synthetic clothing.
Make sure the clothing is______(59),permitting freedom of movement.
And learn the danger______(60)of the medical problems,such as headache and vomiting,that are linked to heat.Most people suffer only muscle pain as a(n)______(61)of heat stress.The fiain is a______(62)that the body is becoming too hot.Doctors say those suffering headache or muscle pain should stop all activity,rest in a cool place and drink cool liquids.Do not return to physical _______(63)for a few hours because more serious conditions could develop.
Doctors say some people face an______(64)danger from heat stress.Such persons have a weak or damaged heart,high blood pressure,or other problems of the blood system.
Hot Weather also increases dangers for people who must take______(65)for high blood pressure, poor blood flow,nervousness or depression.

58._________
A:from
B:in
C:for
D:of

答案：D
解析：
该句意思是：别以为高温仅仅让人们感觉炎热，实际上它还会引发严重的疾病，甚至死亡。cause意思是“引起，造成”，符合句意。make制作；affect影响；form形成。
disasters意思是“灾难”, natural disasters意为“自然灾难”。前面的floods , storms,volcano eruptions都是自然灾害的具体表现，因此B项符合句意。pains疼痛；matters事件；experiences经历。
根据上文意思可知，该句意思是：极热天气更是如此。此处是倒装句，so+助动词+主语，表示主语一也这样。因为extreme heat为单数，所以助动词应用第三人称单数形式。
该句意思是：近来，印度有100多人死于极端高温天气。be blamed for为固定搭配，意思是“对……负有责任”，符合句意。
该句意思是：据报道，一天或几天里遭受持续高温的袭击将影响健康。affect意思是“影响”，符合句意。change改变；obtain获得；cause引起。
该句意思是：如果到夜晚没有降温，热浪是很危险的。drop意思是“下降”，符合句意。soar骤然上升；remove移动；meet遇见，满足。
protect…from…意思是“保护……免受……”，符合句意。keep/stop/prevent…from…阻止……发生。
该句意思是：要穿天然材料制作的衣服，不穿合成面料的服装。be made of意思是“由……制成”（看不出来原材料），符合句意。be made from由……制成（看得出来原材料）;be made in在……制作；be made for为……制作。
根据后半句意思可知，该句意思是：要确保衣服一定要宽松，以便活动自由。loose意思是“宽松的”，符合句意。tight绷紧的；large大的；small小的。
该句意思是：了解高温引发疾病的危险信号，比如头疼、呕吐。signs意思是“信号”，符合句意。designs设计；traits特点；points观点。
该句意思是：大多数人遭受高温仅会感到肌肉疼痛。as a result of为固定搭配，意思是“作为……的结果”，符合句意。
该句意思是：疼痛是对你身体温度过高的警告。warning意思是“警告”，符合句意。inference推理，推断；need需要；guidance指导。
该句意思是：几个小时内都不要再进行体力活动，否则还会导致更严重的状况。activity意思是“活动”, physical activity意为“体力活动”，符合句意。act行为，行动；action行动；acting演戏。
该句意思是：医生指出，一些人面对高温天气的危险又增加了。increased意思是“增多的，增加的”，符合句意。impossible不可能的；incident偶然的；incredible难以置信的。
该句意思是：炎热天气对于那些必须服药以控制高血压等的人也增加了危险。take medicine意思是“服药”，符合句意。take food吃东西；take water喝水；take meal吃饭。

第10题：

单选题
Kapok life jackets should not be（）.
A

stowed near open flame or where smoking is permitted

B

used as seats, pillows, or foot rests

C

left on open decks

D

All of the above


正确答案： D
解析： 暂无解析

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