C类火灾是指（）。 A.固体火灾 B.气体火灾 C.液体火灾 D.金属火灾_爱下问搜题

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问题单项选择题

C类火灾是指（）。

A.固体火灾

B.气体火灾

C.液体火灾

D.金属火灾

答案

参考答案：B

解析：C类火灾：气体火灾。如煤气、天然气、甲烷、乙烷、氢气、乙炔等。实务教材P11

完形填空

完形填空。
Life in 30 years will be 1_ because many changes will take place,but what will the changes be? The population is growing fast. There will be 2 people in the world and most of them will live longer than before. Computers will be 3 smaller and more useful,and there will be at least one in every home. And computer studies will be one of the important 4 inschool. People will work fewer hours than they are doing now,and they will have more free time for sports, watching TV and traveling. Traveling will be much cheaper and 5_ . And many more people will go to other countries 6_ holidays. There will be changes in our food,too. More land will be used for 7 new towns and houses. Then there will be less 8_ for cows and sheep,so meat will be more expensive. Maybe people won't eat it every day.They will eat more vegetables and fruit instead. Maybe people will be healthier. Work in the future will be different,too. Dangerous and hard work will 9_ by robots. Because of this, many people will not have 10 to do. This will be a problem.
( )1. A. same ( )2. A. little and little ( )3. A. much ( )4. A. subject ( )5. A. easily ( )6. A. for ( )7. A. build ( )8. A. rooms ( )9. A. done ( )10.A. works enough	B. differenc B. less and less B. many B. subjects B. more easily B. with B. building B. room B. do B. enough works	C. different C. many and many C. more C. way C. easy C. at C. to build C. spaces C. be done C. work enough	D. difficulty D. more and more D. most D. games D. easier D. in D. builds D. sea D. be did D. enough work

单项选择题

高渗溶液中红细胞形态为

A．皱缩呈锯齿形
B．球形
C．圆盘形
D．影形红细胞
E．椭圆形