问题 问答题 简答题

锅炉对给水有哪几点要求?

答案

参考答案:

锅炉对水质的要求随着锅炉额定压力的提高而提高。给水品质还随电厂的性质而有差别。凝汽式发电厂比热电厂要求高,单段蒸发比分段蒸发要求高,直流锅炉比汽包锅炉要求高。对锅炉给水一般有如下要求:

⑴锅炉给水必须是经化学处理的除盐水。

⑵锅炉给水的压力和温度必须达到规定值。

⑶锅炉给水品质标准要求:硬度、溶解氧、pH值、含油量、含二氧化碳、含盐量、联氨量、含铜量、含铁量必须合格,水质澄清。

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Café Hub

Next to the Castle lies The Hub, home of the Edinburgh International Festival and one of the most talked about spots in town. Our café is open every day for mouth-watering lunches, snacks and fine dining. Come in and enjoy the atmosphere of The Hub or watch the world go by from our beautiful terrace.

The Hub, Castlehill, Royal Mile, Edinburgh. Open every day from 9:30 a. m. till late.

Tel: 0131 473 2067    www. thehub-edinburgh. Com

Farm World

Enjoy being “A Farmer for a Day”. Join in delivering and feeding our spring babies—bottle feeding sessions twice daily. Fun for all family. Horse Rides, BMX Bikes Cross Country Course, Tractor Ride through 600 acres, New Adventure Playground, Nature Trails. Full details on website.

Open: May---Oct Wednesdays to Saturdays and daily during school holidays 11 a. m. ----5 p. m.

Tel: 01797  0260256/260321      www.  Farmworld-rye. co. uk

Enter the Europe-wide student competition!

Are you curious, creative and energetic? Are you interested in the new media? Are you between 12 and 19 years of age? Then Join Multimedia 2010 is for you!

Your challenge will be to build a team and develop a multimedia presentation in English----based on one of three different topics. You can register (报名) between May 1 and Nov. 15, 2010 and will have to turn in your entry before Dec. 15, 2010.

The rewards are wonderful:£150 000in prize for schools and teams and the chance to attend a European student camp ---- plus new experiences, an opportunity to make friends throughout Europe!

小题1:You’ll have to register first if you want _______.

A.to enjoy delicious food

B.to try Tractor Ride through 600 acres

C.to enter the Europe-wide student competition

D.to watch the world go by from the beautiful terrace小题2:According to the passage, there will be _______ rewards for the Europe-wide student competition.

A.only one

B.two

C.three

D.four小题3:You can visit Farm World ________.

A.on Monday in May

B.any day in October

C.at 2 p. m. at Christmas

D.at 10 : 30 a. m. during school holidays小题4:From the advertisements above, we can learn that __________.

A.Café Hub is a popular place in the local area

B.families can enjoy Horse Rides on New Adventure Playground

C.Farm World provides lunches, snacks and fine dining.

D.the Europe-wide student competition will be held on Dec. 15, 2010

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