【单选题】【消耗次数：1】
金属钠、钾失火时，需用的灭火剂是( )。
①
水
②
砂
③
泡沫灭火器
④
液态二氧化碳灭火剂
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【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
【多选题】
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
随机题目
【单选题】
2. I was told yesterday that the company ______ me to Rome next week for a business conference.
①
should have sent
②
was going to send
③
should be sending
④
should send
【单选题】
17.Neither of them ____ the snake.
①
dares catches
②
dare to catch
③
dare catching
④
dare catch
【单选题】
12.You _____ return the book now. You can keep it till next week if you like.
①
cant
②
mustnt
③
neednt
④
may not
【单选题】
6. –Look, someone is coming. Guess who it _____ be?–I think it _____ be Tom.–I don’tthink it _____ be _____.
①
must; can; must; his
②
may; can; must; him
③
must; can; him
④
might; must; can; himself
【单选题】
1. If they ______ to do this work, he might do it some other way.
①
were
②
should
③
will
④
can
【单选题】
8. I______ go to bed until I ______ finished my work last night.
①
Don’t; had
②
didn’t have
③
didn’t; had
④
don’t; have
【单选题】
7. If it is fine tomorrow, we ______ a football match.
①
have
②
will have
③
has
④
shall has
【单选题】
19. _______hand in his exercise book before Monday.
①
Need he to
②
Does he need
③
Needs he to
④
Need he