A check valve is another name for （）.

A . just B . nearly C . merely D . already

A . she can be observed by radar B . she can be observed visually from the other vessel C . she can be plotted on radar well enough to determine her heading D . her fog signal can be heard

A . check valve B . non-return valve C . steam trap D . quick closing tra

A . regulate the fluid flow in either direction B . restrict movement of hydraulic fluid in one direction, but allow free movement in the other direction C . allow free movement of hydraulic fluid in both directions D . allow a restricted fluid flow in one direction only

A . after the discharge valve B . between the pump and discharge valve C . after the suction valve D . between the pump and suction valve

A . detect the temperature B . detect the pressure C . heat the refrigerant D . accelerate the refrigerant

A . reading the gage pressure B . weighing the extinguisher C . discharging a small amount of CO D . seeing if the seal has been broke

A . maintain a preset pressure on the line B . closely regulate the amount of flow C . relieve excessive pressure on the line D . allow flow in one direction only

A . evaporator pressure decrease B . evaporator coil over-feed C . evaporator capacity increase D . expansion valve diaphragm rupture

A . open；short；after B . closed；short；after C . open；long；before D . closed；long；before

A . reading the gage pressure B . weighing the extinguisher C . discharging a small amount of CO D . seeing if the seal has been broke

A . reading the gage pressure B . weighing the extinguisher C . discharging a small amount of CO D . seeing if the seal has been broke

A . crossover B . runaround C . come-along D . manifold

A . an air start cam B . cylinder compression pressure C . starting air pressure D . valve spring

A . assist in a quick cutoff of fuel injection B . allow oil backflow from the injector to the helix C . reduce fuel oil pressure between injection strokes D . meter the quantity of fuel delivered

A . the stem and heads are made of different material B . low-alloy steel is used throughout C . a replaceable valve disk is welded to the head D . the self-centering action comes from motion of the valve stem in the guide

A . come-along B . crossover C . manifold D . runaround

A . deliver proper fuel quantity to the injection nozzle B . provide rapid fuel injection cutoff C . control fuel quantity entering the pump body D . control fuel pressure delivered to the combustion chamber

A．the person who is to receive payment B．the bank that has to make payment C．the last person to endorse the check D．the person whose bank account will be debited

He works for a small company in Liverpool, where most young people of his age are looking for jobs. Brendan's biggest headache is how to use his money. Though he has high payment, he cannot drive a car, or get credit cards. Brendan got his job four months ago, a year after leaving school with six Olive's(普通成绩)and working for a time in a computer shop. "I got the job because the people who run the company knew I had already written some programs. " he said. "I suppose 55000 pounds sounds a lot but I hope it will come to more than that this year. "He spends some of his money on records and clothes, and gives his mother 20 pounds a week as he lives with his parents. But most of his spare time is spent working. "Unfortunately, computing was not part of our studies at school," he said. "But I had been studying it in books and magazines for four years in my spare time. I knew what I wanted to do and never considered staying on at school. Most people in this business are fairly young, anyway. I would like to earn a million and I suppose early retirement (退休)is a possibility. You never know when the market might disappear. " Why is Brendan so different from other young people of his age？ A．He earns an extremely high payment. B．He has got a job. C．He lives at home with his parents. D．He does not go out much.