问题 问答题 简答题

应怎样选择润滑油?

答案

参考答案:

1、应根据使用条件和机床使用说明书要求选用。

2、一般冬季用10号机械油,夏季用20或30号,使用时油温不宜超过60℃。

3、速度高或作旋转运动则须采用粘度低的油。

4、用于精密调整时,用粘度较低的油。

5、如果环境温度较高或可能有水分浸入时,要求采用抗乳化性能良好的油。

6、长期在较高温度下使用的油,应具有较高的抗氧化性能。

阅读理解

阅读理解。

     The Japanese government has launched a campaign encouraging people to go to bed and get up extra early

in order to reduce household carbon dioxide emissions.

     The Morning Challenge campaign, made public by the Environment Ministry, is based on the premise (前提)

that exchanging late night electricity for an extra hour of morning sunlight could significantly cut the nation's

carbon footprint.

     A typical family can reduce its carbon dioxide footprint by 85kg a year if everyone goes to bed and gets up

one hour earlier, according to the campaign.

     The amount of carbon dioxide emissions potentially saved from going to bed an hour early was the

equivalent of 20 percent of annual emissions from household lights, "Many Japanese people waste electric

power at night time, for example by watching TV until very late," a ministry spokesperson told The Daily

Telegraph.

     "But going to bed early and getting up early can avoid wasting electrical power which causes carbon

dioxide emissions. If people change their lifestyle, we can save energy and reduce emissions." The campaign

also proposes that people take advantage of an extra hour of morning sunlight by improving their lifestyles in

general by running, doing yoga and eating a nutritious breakfast.

     It is the latest measure dealing with climate change by the Japanese Environment Ministry, which is faced

with the challenge of reducing carbon dioxide emissions by 25 per cent from 1990 levels within the next

decade.

      It was the same government department that started the high profile (姿态) Cool Biz campaign five years

ago, which encourages workers to wear short-sleeved shirts and offices not to turn air con lower than 28

degrees during the summer.

1. What does Morning Challenge claim is the purpose of its campaign?

A. To promote a healthier lifestyle.

B. To encourage people to watch less TV.

C. To reduce household carbon dioxide emissions.

D. To show the sense of responsibility of the Japanese government.

2. The Japanese government has to reduce carbon dioxide emissions in the next ten years by _____ on

the 1990 levels.

A. 20%

B. 25%

C. 85%

D. 28%

3. Which of the following is TRUE according to the article?

A. The Japanese government is the first government to deal with the environmental problem.

B. Carbon dioxide emissions are more serious in Japan than in any other country.

C. The Japanese Environment Ministry is responsible for climate change.

D. The purpose of Cool Biz campaign is similar to that of the Morning Challenge.

单项选择题