【多选题】【消耗次数：1】
下列物质引起的火灾属于C类火灾的是（）。
①
A.木材
②
B.金属
③
C.煤气
④
D.氢气
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【判断题】
《火灾分类》（GB/T4968—2008）按物质的燃烧特性将火灾分为：A 类火灾，B 类火灾、C 类火灾、D 类火灾、E 类火灾和 F 类火灾，其中带电电缆火灾属于E类火灾。
①
正确
②
错误
【单选题】
下列物质的熔点由高到低的顺序为a. CuCl2 b. SiO2 c. NH3 d. PH3
①
A．a＞b＞c＞d
②
B．b＞a＞c＞d
③
C．b＞a＞d＞c
④
D．a＞b＞d＞c
随机题目
【单选题】
16. As I will be away for at least a year, I’d appreciate____ from you now and then so that I can know how everyone is getting along.
①
having heard
②
to hear
③
hearing
④
beingheard
【单选题】
7.He looked around and caught a man____his hand into the pocket of a passenger.
①
put
②
to be put
③
to put
④
putting
【单选题】
14.The thief fell to the ground，his left foot ____and blood ____down from his mouth.
①
breaking; running
②
broken; running
③
breaking; run
④
broken; run
【单选题】
18.- Did you get a dictionary?- No, I _____, but there were not any _____.
①
tried; to be left
②
had tried to; leaving
③
tried to; left
④
had tried; have left
【单选题】
4.____the diamond, he had to look for a place to hide it.
①
Having stolen
②
Having been stolen
③
Stolen
④
Stealing
【单选题】
12.You can’t imagine what great trouble they have ____the problem____.
①
to solve; being talked about
②
solving; discussing
③
to solve; to talk about
④
solving; being discussed
【单选题】
6.And there, almost____in the big chair, sat her little brother, who never had to be told to keep quiet.
①
having lost
②
losing
③
to be lost
④
lost
【单选题】
17.____, the subject was always in my mind.
①
Walking or sleeping
②
Walking or slept
③
Having walked or slept
④
To walk and sleep
【单选题】
20. The joke told by Tom made us_____, so our maths teacher couldn’t make himself _____.
①
to laugh; hearing
②
laughing, heard
③
laughing; hear
④
laughed; heard
【单选题】
15.The program was so exciting that the children kept their eyes ____on the screen.
①
to fix
②
to be fixed
③
fixed
④
fixing