首页
登录
职称英语
The 10th launch of the space shuttle Challenger was scheduled as the 25th spa
The 10th launch of the space shuttle Challenger was scheduled as the 25th spa
游客
2023-12-18
42
管理
问题
The 10th launch of the space shuttle Challenger was scheduled as the 25th space shuttle mission. Francis R. (Dick) Scobee was the mission commander. The crew included Christa McAuliffe, a high-school teacher from New Hampshire. The five other crew members were Gregory B. Jarvis, Ronald E. McNair, Ellison S. Onizuka, Judith A. Resnik, and Michael J. Smith.
After several launch delays, NASA officials overruled the concerns of engineers and ordered a liftoff on a cold morning, Jan. 28, 1986. The mission ended in tragedy. Challenger disintegrated into a ball of fire. The accident occurred 73 seconds into flight, at an altitude of 14020 meters and at about twice the speed of sound.
Strictly speaking, Challenger did not explode. Instead, various structural failures caused the spacecraft to break apart. Although Challenger disintegrated almost without warning, the crew may have briefly been aware that something was wrong. The crew cabin tore loose from the rest of the shuttle and soared through the air. It took almost three minutes for the cabin to fall to the Atlantic Ocean, where it smashed on impact, killing the seven crew members.
All shuttle missions were halted while a special commission appointed by President Reagan determined the cause of the accident and what could be done to prevent such disasters from happening again. In June I986, the commission reported that the accident was caused by a failure of O rings in the shuttle’s right solid rocket booster. These rubber rings sealed the joint between the two lower segments of the booster. Design flaws in the joint and unusually cold weather during launch caused the O rings to allow hot gases to leak out of the booster through the joint. Flames from within the booster streamed past the failed seal and quickly expanded the small hole. The flaming gases then burned a hole in the shuttle’s external fuel tank. The flames also cut away one of the supporting beams that held the booster to the side of the external tank. The booster tore loose and ruptured the tank. The propellants (火箭燃料) from the tank formed a giant fireball as structural failures tore the vehicle apart.
The commission said NASA’s decision to launch the shuttle was flawed. Top-level decision makers had not been informed of problems with the joints and O rings or of the possible damaging effects of cold weather.
Shuttle designers made several technical modifications, including an improved O-ring design and the addition of a crew bail-out system. Although such a system would not work in all cases, it could save the lives of shuttle crew members in some situations. Procedural changes included stricter safety reviews and more restrictive launching conditions. The space shuttle resumed flying on Sept.29, 1988, with the launch of the redesigned shuttle Discovery. (465 words) [br] It is obvious from Paragraph 4 that the chief cause leading to the disaster is ______.
选项
A、the leakage of the O rings
B、cold weather
C、structure failures
D、the faulty fuel tank
答案
A
解析
见上一题对选择项C的解释。
转载请注明原文地址:https://tihaiku.com/zcyy/3283200.html
相关试题推荐
SteveFossettlandedinhisdestinationaheadofscheduledtimebecause[origina
TwospaceshuttleastronautsscalingtheoutsideoftheInternationalSpaceS
TwospaceshuttleastronautsscalingtheoutsideoftheInternationalSpaceS
TwospaceshuttleastronautsscalingtheoutsideoftheInternationalSpaceS
[originaltext]BadweatherforcedmissionmanagerstopostponelaunchingNASA
Wedonotknowwhofirstsetabrokenleg,orlaunchedaseaworthyboat,orc
Oneofthemostsuccessfulcommercialproductseverlaunchedissaidtohave
Oneofthemostsuccessfulcommercialproductseverlaunchedissaidtohave
Oneofthemostsuccessfulcommercialproductseverlaunchedissaidtohave
Oneofthemostsuccessfulcommercialproductseverlaunchedissaidtohave
随机试题
Havingoperatedforover4decades,Escapehasdevelopedastrongreputation
Althoughfewwoulddenythatit’sbettertoberichthanpoor,forsomepeop
[originaltext]SomethingstrangehappenseveryyearfromAugust6to15ont
心理咨询与思想政治工作两者的目的都在于促进学生的健康成长。
非洲独立年是指哪一年?()A.1957年 B.1958年 C.1959年
中腹壁反射,反射中枢在A.胸髓11~12节 B.胸髓9~10节 C.颈髓7~
证券投资顾问执业行为准则包括()。 ①证券投资顾问不得为公司及其关联方的利益
产业增收是脱贫攻坚的主要途径和长久之策。以下举措不属于产业扶贫的是:A.种植特色
(2017年5月)绩效计划沟通的具体内容包括()。A.计划改进 B.目
借款人伪造良好的信用记录、掩盖不良的贷款用途违背了()。A.全流程贷款管理
最新回复
(
0
)