【多选题】【消耗次数：1】
局部应用二氧化碳灭火系统的应用条件是（）
①
A在气体喷头与保护对象之间，喷头喷射角范围内不应有遮挡物
②
B当被保护对象为可燃性液体时，液面至容器口的距离不应小于150mm
③
C灭火剂的喷射时间一般不小于0.50min
④
D保护对象周围的空气流速不宜大于3m/s，必要时应采取挡风措施
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相关题目
【单选题】
二氧化碳灭火系统按应用方式可分为（）
①
A组合分配灭火系统和单元独立灭火系统
②
B高压系统和低压系统
③
C管网灭火系统和无管网灭火系统
④
D全淹没灭火系统和局部应用灭火系统
【判断题】
气体灭火系统采用的是冷却、窒息（稀释氧气）、隔离（去除燃料）和化学抑制方法中的一种或多种方法。一般包括二氧化碳灭火系统、水蒸气灭火系统、氦气灭火系统和烟雾灭火系统、卤代烷灭火系统等
①
正确
②
错误
【判断题】
二氧化碳灭火器是利用其内部充装的液态二氧化碳的蒸气压将二氧化碳喷出灭火的一种灭火器具，其通过降低氧气含量，造成燃烧区窒息而灭火，一般能造成燃烧中止的氧气含量应低于12%。
①
正确
②
错误
【单选题】
二氧化碳被称为温室气体，是因为二氧化碳能（）。
①
A.吸收太阳辐射，使人体增温
②
B.破坏臭氧，使到达地面的紫外线增多
③
C.强烈地吸收地面放出的长波辐射
④
D.通过光化学反应向大气中释放热能
【单选题】
空气中的二氧化碳仅占空气体积总量的（）。
①
A.0.01%－0.02%
②
B.0.03%－0.04%
③
C.0.05%－0.06%
④
D.0.07%－0.08%
随机题目
【单选题】
If the scheme is _____carried out without waste of time or energy I shall be completely satisfied.
①
relatively
②
noticeably
③
appropriately
④
efficiently
【单选题】
When we drove to the country, we saw many _____.
①
herds of cattles
②
herds of catt
③
herd of cattle
④
herd of cattles
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Televisions enable us to see things happen almost at the exact moment _____.
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which they are happening
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they are happening
③
which they happen
④
they have happened
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To their credit the Department of Energy _____these ideas and funded a detailed study.
①
took over
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took on
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took up
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took to
【单选题】
Once our chickens started laying eggs, we had such a _____of eggs that we were giving many away to our neighbors.
①
output
②
surplus
③
production
④
plenty
【单选题】
Individual lines of the poem were very beautiful, but I didn’t see how the lines fit together. To me, the poem wasnt _____.
①
inherent
②
coherent
③
logical
④
corporate
【单选题】
This book has been in the works so long that I have lost _____of most of the sources found for me by the staff of the library.
①
trace
②
trail
③
track
④
touch
【单选题】
_____ for a long time, the fields are all dried up.
①
There has been no rain
②
Having no rain
③
There having been no rain
④
There being no rain
【单选题】
She often says her greatest happiness _____serving the handicapped children.
①
relies on
②
consists in
③
composes of
④
comprises in
【单选题】
_____ me most was that the young boy who had lost both arms in an accident could handle a pen with his feet.
①
That amazed
②
It amazed
③
Which amazed
④
What amazed