问题
多项选择题
火灾的三要素是( )。
A．氧化剂
B．可燃物
C．燃烧原因
D．燃烧方式
E．点火源
答案
参考答案：A,B,D
解析：同时具备氧化剂、可燃物、点火源，即火的三要素。这三个要素中缺少任何一个，燃烧都不能发生或持续。
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火灾的三要素是( )。
A．氧化剂
B．可燃物
C．燃烧原因
D．燃烧方式
E．点火源
参考答案：A,B,D
解析：同时具备氧化剂、可燃物、点火源，即火的三要素。这三个要素中缺少任何一个，燃烧都不能发生或持续。
| broadcast1/'brɔ:dkɑ:st||ˈbrɔdˌkæst/n[C] a programme on the radio or on television: a radio news broadcast | live broadcast ( =" a" programme that you see or hear at the same time as the events are happening) broadcast2 v past tense and past participle, broadcast 1 [ I,T] to send out radio or television programmes: The interview was broadcast live across Europe. 2 [T] to tell something to a lot of people: There was no need to broadcast the fact that he lost his job. broadcaster /ˈbrɔːdkɑːstə || ˈbrɔːdkæstər/ n [C] | curious/ˈkjʊəriəs || 'kjur-/ adj 1 wanting to know about something: When I mentioned her name everyone was curious. | [ +about] I’m incurious about this book she's supposed to be writing. |curious to see/hear/know etc: Mandy was curious to hear what Peter had to say himself.—opposite INCURIOUS 2 strange or unusual: a curious noise coming from the cellar | curious that It's very curious that she left without saying goodbye. curl1 /kɜ:l|| kɚrl/ n 1[C] a small mass of hair |
| flask / flɑ:sk || flæsk/n [C] I BrE a special type of bottle that you use to keep liquids either hot or cold, for example when travelling 2 a flat bottle usually used to carry alcohol 3 a glass bottle with a narrow top, used in a LABORATORY flat1/ flæt / adj flatter, flattest 1▶ SURFACE◀ smooth and level, without raised or hollow areas, and not sloping or curving: a flat-bottomed boat |a perfectly flat sandy beach | flat as a | pollute / pə'lu:t/ v [T] 1 to make air, water, soil etc dangerously dirty and not suitable for people to use: beaches polluted by raw sewage | industrial emissions that pollute the air 2 pollute sb’s mind to give someone immoral thoughts and spoil their character: fears that Lawrence's novels would pollute young minds--polluted adj: polluted rivers--polluter n [C] pollution / pəˈlu:ʃn /n [U] 1 the process of making |
小题1:The pronunciation of the word "broadcast" is ____ or/ˈbrɔdˌkæst /.
A．/'brɔ:dkɑ:st/
B．/'brəud'sɑ:st/
C．/bræd'kɔst/
D．/'bru:dkɑ:st/小题2:The word"____ "can be used as an adjective (形容词).
A．pollute
B．pollution
C．curious
D．curiously小题3:Which of the following is a flask?
A．
B．
C．
D．小题4: The word "pollute" means "______".
A．to tell something to a lot of people
B．wanting to know about something
C．a programme on the radio or on TV
D．to make air. water, soil, etc dirty小题5:These texts are probably from ______.
A．a magazine
B．a dictionary
C．a newspaper
D．an advertisement