海损协议书

某酯的化学式是C₁₄H₁₂O₂，它可由醇a和羧酸b发生酯化反应得到。经测知该酯不能使溴水褪色；醇a最终可得到羧酸b，下列有关叙述中正确的是

A．此酯中必然含有碳碳双键或三键

B．此酯中的化学键全都是极性共价键

C．酯中有环状结构，而a或b只有一种有环状结构

D．酯、醇a、羧酸b都有同种环状结构，且该酯能浮于水面上

Driver Wanted

Clean driving license(执照).

Must be of smart appearance.

Age over 25.

Apply to(申请): Capes Taxi, 17 Palace Road, Royston.

Air Hostesses for International Flights Wanted

Applicants(申请者) must be between 20 and 33 years old.

Height: 1.6 m to 1.75 m.

Education to GCSE standard.

Two languages. Must be able to swim.

Apply to: Recruitment(招聘) office, Southern Airlines, Heathrow Airport West. HR 37 KK.

Teachers Needed

For private language school.

Having college education.

Teaching experience unnecessary.

Apply to: The Director of Studies, Instant Languages Ltd. 279 Canal Street, Royston.

小题1: What prevents Jack, an experienced taxi driver, working for Capes Taxi?

A．Fond of beer and wine.

B．Punished for speeding and wrong parking.

C．Unable to speak a foreign language.

D．Not having college education.小题2:Ben, aged 22, fond of swimming and driving, has just graduated from a college.

Which job might be given to him?

A．Driving for Capes Taxi.

B．Working for Southern Airlines.

C．Teaching at Instant Languages Ltd.

D．None of the three.小题3:What prevents Mary, aged 25, becoming an air hostess?

A．She once broke a traffic law and was fined

B．She can’t speak Japanese very well.

C．She has never worked as an air hostess before.

D．She doesn’t feel like working long hours flying abroad.小题4:Which of the following is not mentioned in the three advertisements?

A．Marriage.

B．Male or female.

C．Education.

D．Working experience.

多尿

DCS上所有装置数据都显示为“？”或“*”这是DCS的（）故障。

A、通讯处理器

B、显示器

C、工作站死机

D、安全栅