成功理工职场英语答案

Unit 4 Safety, Maintenance, and Quality Control

Lessons

Team Project

Review

Additional Resources

EXIT

成功理工职场英语答案

Unit 4 Safety, Maintenance, and Quality ControlLesson 1. What caused the explosion Lesson 2. The prevention of accidents

Lesson 3. Wearing special clothesLesson 4. The amplitude of motion Lesson 5. Quality and a finished item

Lesson 6. A “ total quality control” approachEXIT

成功理工职场英语答案

Unit 4 Safety, Maintenance, and Quality Control

Additional Activities Reading Resources Additional Resources Writing Resources Unit Test Grammar Resources

EXIT

成功理工职场英语答案

Lesson 1

What caused the explosion

a Look at the photograph below and, in pairs, answer thequestions. 1. What accident does the photograph show? 2. When and where did this incident take place? 3. What caused the accident? 4. How many lives were lost in the accident?

成功理工职场英语答案

b Skim through the text quickly to check your answers.

A

NASA space shuttle consists of three major components: a winged orbiter that carries both crew and cargo, an external tank containing liquid hydrogen (fuel) and liquid oxygen (oxidizer) for the orbiter’s three main rocket engines, and a pair of large solid-propellant rocket boosters (SRBs). On January 28, 1986, the Challenger shuttle and its crew of seven (including teacher Christa McAuliffe, who had been selected to be the first private citizen in space) were destroyed shortly after launch from Cape Canaveral, Florida. The primary cause of the loss of the Challenger was the failure of an O-ring seal of a joint on one of the solid rocket boosters. The SRBs are constructed in four cylindrical sections. These have to be sealed together completely to prevent the escape of the extremely hot by-products of the burning fuel during a launch. The O-rings are rubber rings that play a vital part in sealing the joints.

成功理工职场英语答案

On the day of the launch, the weather was unusually cold and this caused the rubber of one of the O-rings on the joint between the bottom two segments of the right SRB to become brittle. This, combined with the faulty design of the joint, allowed hot gases from the burning solid rocket fuel to escape. The gases and flames burned through the metal that held the SRB in position. When the SRB broke off, it ruptured the side of the external fuel tank. This allowed the liquid hydrogen and oxygen to mix prematurely and this is what caused the explosion.

成功理工职场英语答案

c Read the first paragraph of the text and, in the diagram,label the three main components of the space shuttle. History capsule Another tragic accident occurred on February 1, 2003, when the Columbia space shuttle broke up over north-central Texas at an altitude of about 40 miles (60 kilometers) as it was returning from an orbital mission. All seven crew members died in the accident.

a. ___________________________________ b. ___________________________________ c. ___________________________________ ___________________________________

成功理工职场英语答案

d Read through the text again and complete the sentenceswith because or so.

Key

1. The O-ring was brittle __________the weather was cold. because so 2. The O-ring was brittle, ____this allowed hot gases to escape from the SRB. 3. The metal holding the rocket was damaged, ____ so the rocket broke loose. 4. The hydrogen and oxygen mixed and exploded __________ because the rocket ruptured the fuel tank.

成功理工职场英语答案

e In your notebook, write four conditional sentences about thecauses of the accident. eg. If the weather had not been cold, the O-ring would not have become brittle.

f Draw a series of diagrams to explain exactly what caused theChallenger accident.

g In pairs or small groups, discuss your reactions to what youread in the text.

成功理工职场英语答案

h Listen to an interview with a NASA spokesperson andanswer the questions.Script Key

1. When was the Presidential Commission on the Space Shuttle Challenger Accident created? Early February 1986. ____________________________________________________ 2. Who was named chairman of the commission? William P. Rogers. _____________________________________________________ 3. Who set up the Challenger Data and Design Analysis Task Force? NASA. _____________________________________________________ 4. How long did the commission’s investigation take? Four months. _____________________________________________________ 5. How many people were involved in the investigation? More than 6,000. _____________________________________________________ 6. When was the commission’s report published? Early June 1986. _____________________________________________________

成功理工职场英语答案

i Listen to the next part of the interview and complete the notes.Script Key

completely redesigned 1. SRBs: _______________________________ 2. A new joint design: _________________________________________ subjected to stringent examination and review 3. Main space shuttle engines: __________________________________ put through most thorough ground-testing _________________________________________________________ program in their history, equivalent to more than 36 real missions 4. Office of Safety, Reliability, Maintainability, and Quality Assurance:____ _____________________ established in 1986

成功理工职场英语答案

j Research and prepare a report about another accident.

Describe what caused the accident (mechanical failure, electrical failure, materials failure, human error, etc.), how the accident c …… 此处隐藏：8213字，全部文档内容请下载后查看。喜欢就下载吧 ……