问题 问答题 简答题

炸药的起爆、起爆能和感度?

答案

参考答案:

1.炸药的起爆和起爆能

炸药是一种相对稳定的物质,是具有稳定性和爆炸性的矛盾统一体。在没有外界作用时不发生爆炸反应,在受到外界足够能量的作用时才发生爆炸。激发炸药爆炸的过程叫起爆。为使炸药爆炸,外界对炸药作用的最小能量称为起爆能。

起爆能主要有热能、机械能和爆炸能三种形式。了解起爆和起爆量,对于正确选用起爆形式,防止爆破事故的发生意义非常大。

2.炸药的感度

炸药在外界作用时起爆的难易程度叫炸药的感度。感度的高低以激发炸药爆炸所需起爆能的大小来衡量。炸药起爆时所需起爆能越少,表示炸药的感度越高;反之表示感度越低。

炸药对不同形式的起爆能具有不同的感度。如梯恩梯炸药,对机械作用的感度较低,而对电火花的感度则较高。如果炸药感度高,就会给生产、贮存、运输和使用带来不安全隐患。因此,在炸药生产过程中要设法改变炸药的某些感度。

完形填空

第二节完型填空(共20小题;每小题1.5分,满分30分)

阅读下面短文,掌握其大意,从每题所给的A、B、C、D四个选项中,选出最佳选项,并在答题卡上将该项涂黑。

Mum keeps telling me “Turn the radio down!” or “Can’t you listen to anything else” or “I don’t know how you can  36  with all noises.” Even my friends at school don’t appreciate the  37  I love, and my best friend told me I am a ‘radio junkie.’

I thought about the music that  38  me each day. It represented a wide range of music  39  ——I certainly wasn’t narrow—minded. I don’t only listen to hard roc, but also to music from the 70’s, 80’s and 90’s, and it isn’t really that  40  . Perhaps my mum and dad aren’t as square as I thought they were, if that’s the sort of music they  41  .

While music is the most important  42  I listen to my radio, it’s not the only one. my favorite station has many  43  presenters, from the wake—up show to the latest night ‘stop—outs’, and with all sorts of up —beat variations in between. My ‘must—listen—to’  44  is the top 40 countdown where I get to   45  all the latest and very best music selections.

Do I learn anything form the  46  I listen to? Of course I do! If you listen   47  to the lyrics of most songs, they have something to  48  about every aspect of life. People who are sad, mad, glad or bad, all  49  their feelings in the songs they sing or in the music they play. You see, I’m learning  50  other people cope with these feelings, and in some small way, it’s helping me too.

Competitions, talk—back programs and the dreaded ‘ads’, are all  51  of radio, but it’s the music that attracts me most. I’ve   52  learned to do all sorts of things while listening to the music on the radio. I can do my homework, play sport, have a shower, get dressed,   53  while listening to the radio!

I’d rather not be  54  radio junkie, but if that’s the word that describes my radio listening  55  most exactly, then I guess I’ll have to live with it. my music suits me and I suit my music.

36.A.talk          B.think     C.listen         D.deal

37.A.noise         B.radio     C.music          D.thing

38.A.surrounds     B.encouragesC.educates      D.touches

39.A.lovers          B.boxes       C.lessons         D.styles

40.A.new         B.bad      C.perfect         D.particular

41.A.repeated      B.played      C.enjoyed       D.wrote

42.A.reason         B.thing     C.excuse         D.subject

43.A.experienced     B.different   C.popular        D.excellent

44.A.performance    B.record      C.edition         D.favorite

45.A.collect         B.see       C.hear         D.buy

46.A. songs         B.concerts    C.bands          D.programs

47.A.exactly        B.carefully   C.immediately     D.constantly

48.A.worry          B.argue     C.care          D.say

49.A.express        B.understandC.share         D.describe

50.A.whether       B.that      C.how         D.why

51.A.topics          B.sorts     C.value         D.part

52.A.even         B.ever     C.already        D.just

53.A.those         B.all        C.ones         D.everything

54.A.regarded      B.elected      C.called          D.named

55.A.stations        B.hobbies     C.selections      D.habits

单项选择题