首页
登录
职称英语
The very high temperatures attained in a nuclear explosion result in the for
The very high temperatures attained in a nuclear explosion result in the for
游客
2024-02-16
16
管理
问题
The very high temperatures attained in a nuclear explosion result in the formation of an extremely hot intense mass of gas called a fireball. For a l0-kiloton (千吨,核弹当量单位) explosion in the air, the fireball will attain a maximum diameter of about 300m; for a l0-megaton (兆吨,核弹当量单位) weapon the fireball may be 4.8 km across. A flash of heat radiation is emitted from the fireball and spreads out over a large area, but with steadily decreasing intensity. The amount of heat energy received a certain distance from the nuclear explosion depends on the power of the weapon and the state of the atmosphere. If the visibility is poor or the explosion takes place above clouds, the effectiveness of the heat flash is decreased. The heat radiation falling on exposed skin can cause what called flash burns. A 10-kiloton explosion in the air can produce moderate (second-degree) flash burns, which require some medical attention, as far as 2.4 km from ground zero; for a 10-megaton bomb, the corresponding distance would be more than 32 km. milder burns of bare skin would be experienced even farther out. Most ordinary clothing provides protection from the heat radiation, as does almost any opaque (不透明的) object. Flash burns occur only when the bare skin is directly exposed, or if the clothing is too thin to absorb the heat radiation.
The heat radiation can start fires in dry, flammable materials, for example, paper and some fabrics, and such fires may spread if conditions are suitable. The evidence from the A-bomb explosions over Japan indicates that many fires, especially in the area near ground zero, originated from secondary causes, such as electrical short circuits, broken gas lines, and upset furnaces and boilers in industrial plants. The blast damage produced wreckage that helped to maintain the fires and denied access to fire-fighting equipment. Thus, much of the fire damage in Japan was a secondary effect to the blast wave.
Under some conditions, such as existed at Hiroshima but not at Nagasaki, many individual fires can combine to produce a fire storm similar to those that accompany some large forest fires. The heat of the fire causes a strong updraft (向上排气), which produces strong winds drawn in toward the center of the burning area. These winds fan the flame and convert the area into a disaster in which everything flammable is destroyed. [br] According to the passage, a fire storm______.
选项
A、is often seen when large forest fires break out.
B、often occurs after the atomic explosions
C、produces forces that draw everything into the fire
D、is a disaster that can destroy everything in the area
答案
A
解析
事实细节题。文章在提到大火灾时说它经常会伴随一些森林大火出现,所以,A“经常与森林大火一同出现”为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3455371.html
相关试题推荐
Themostpressingnuclearenergyissueisthedisposalofnuclearwaste.Eve
Themostpressingnuclearenergyissueisthedisposalofnuclearwaste.Eve
Themostpressingnuclearenergyissueisthedisposalofnuclearwaste.Eve
[originaltext]W:What’stheresultofthefootballmatchbetweenItalyandArge
[originaltext]W:What’stheresultofthefootballmatchbetweenItalyandArge
[originaltext]W:What’stheresultofthefootballmatchbetweenItalyandArge
[originaltext]W:What’stheresultofthefootballmatchbetweenItalyandArge
Whichofthefollowingisthebesttitleforthepassage?[br]What’stheresult
Thecommunicationsexplosionisonthescaleoftherail,automobileortele
Thecommunicationsexplosionisonthescaleoftherail,automobileortele
随机试题
[originaltext]W:Whendoyouneedtohavethelettertyped?M:Thesoonerthe
WhentoBuyYourChildaCellphoneDavidPogerhadplann
砌筑砂浆的技术性质主要包括新拌砂浆的密度、和易性、硬化砂浆强度和对基面的粘力、抗
信息的主要特征有()A.信息的可转换性 B.信息的可再生性 C.信
某男,40岁。突发寒战、稽留型高热、剧烈头痛入院,给予青霉素治疗3天无明显好转,
某产妇,产褥期出现高热,护士为其采取的护理措施应除外A.卧床休息取半卧位 B.
患者久咳,沂期又患蛔虫腹痛。治疗宜选用A.诃子 B.芡实 C.乌梅 D.肉
A.长于活血化瘀B.善于消食化积C.长于消食止泻D.具有止血、止泻的功效E.善于
谈谈程序化训练模式的基本步骤。
当总需求严重不足、生产能力未得到充分利用时,应采用()。A.“双紧”政策 B
最新回复
(
0
)