题目内容
（请给出正确答案）
When steam is being raised on a boiler, the water level will normally _____.
A.drop as the boiler warms up
B.rise as the boiler warms up
C.remain unchanged until the boiler is hot enough
D.rise and fall with the steam demand
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更多“When steam is being raised on …”相关的问题
第1题
听力原文： Thirty-two people watched Kitty Genovese being killed fight beneath their windows. She was their neighbor. Yet none of the 32 helped her. No one even called the police. Was it lack of feeling about one's fellow man？
"Not so," say scientists John Barley and Bib Fatane. These men went beyond the headlines to look for the reasons why people didn't act. They found that a person has to go through two steps before he can help.
First he has to notice that it is an emergency. Suppose you see some smoke. Is the smoke coming into the room from a leak in the air conditioning？ Is it "steam pipes"？ Or is it really smoke, from a fire？ It's not always easy to tell if you are faced with a real emergency.
Second, and more important, the person faced with an emergency must feel personally responsible. He must feel that he must help, or the person won't get the help.
Tests show that in a group, Americans often fail to act. They feel that others will act. They, themselves, needn't. They do not feel any direct responsibility.
Are people bothered by situations where people are in trouble？ Yes, scientists found that the people were emotional, they sweated, they had trembling hands. They felt the other person's trouble. But they did not act. They were in a group. Their actions were shaped by the actions of those they were with.
(30)
A．To explain why people fail to act in emergencies.
B．To explain when people will act in emergencies.
C．To explain what people will do in emergencies.
D．To explain how people feel in emergencies.
第2题
Water always ______ steam when boiled.
A．gives out
B．gives up
C．gives off
D．gives in
第3题
Water always ______steam when boiled.
A．gives out
B．gives up
C．gives off
D．gives in
第5题
The water level in a steaming auxiliary boiler will always _____.
A.rise when the steam pressure is increased
B.remain constant as long as the feed pump operates
C.fall when the steam pressure is decreased
D.vary as the steam demand changes
第6题
Water always ______ steam when boiled.
A．gives out
B．gives up
C．gives off
D．gives in
第7题
第8题
When the fuel oil is burning in the combustion chamber, it _____.
A.gives up large amount of heat
B.gives off large amount of heat
C.gives up large amount of steam
D.gives off large amount of steam
第9题
Procrastination(犹豫不决) is a disease of the mind. A scientific study in recent years has shown that it is a close relative of sadness and attention disorder; that procrastinators tend to be the result of low self-confidence and are likely to experience anxiety.
The research has shown, what is more, that the illness has become quite common. Susan Robert, a behavioral psychologist who has written a book called Living With Procrastination., says that about a quarter of the adult population of the United States and Canada is reported to have serious problems with procrastination. " when we say 'serious' we mean people for whom procrastination causes great discomfort and suffering. We 've found that such people are more troubled by daily life than others, that possibility of anxieiy is much higher among them than in the rest of the population.
In a society driven by achievement, it is little wonder that not being able to work at full steam will bring people sadness. Surely, in the land of opportunity, this anxiety has produced an industry of experts offering solutions. Many books and specialist solutions have appeared. In exchange for $19. 95, Dr. Jerome Murray will send out an audio-cassette called "Protect your future from the thief of procrastination. " Dr. Murray promises that if you follow his step-by-step rules you will be empowered to "turn self-defeat into self-realization". "Since the start of the 1990s, procrastination has been taken more and more seriously , " said Dr. Roberts, who has been treating patients troubled by the condition for more than 20 years. "It is now recognized as a true mental heath problem and is being seen more as a psychological problem and less as a moral issue.
What is the main topic of this passage？
A．Don't hesitate to give up smoking.
B．Don't regard depression as not important.
C．Delay can be a sign of illness.
D．Don't work too hard to stay healthy.
第10题
Everyone needs and uses energy. If there were no energy,【46】
Most of the energy on this planet comes from the sun, but people do not receive that energy directly. It comes from different sources and in different forms.
Green plants convert the sun's energy to food energy that animals and people use for life. The energy from animals has been used for hundreds of years to operate farm equipment and to pull carts, wagons , and other vehicles.
The sun's energy takes water from rivers, lakes, and oceans and【47】When rain or snow falls on the land some of it flows into rivers and streams. This flowing water can be used to【48】Water can also be converted (更换) to steam, which produces energy to operate machines.
Winds also come from solar energy. Air that has been heated by the sun rises and creates winds. The process of winds has moved ships on the sea, ground grain, and brought water to the earth.
There is also solar energy in wood, oil, and coal. These fuels have been【49】People burn them to produce heat and to create power for machines. Oil and coal are used to produce electrical energy, too. And electricity produces light heat, and sound energy. In addition, electric power operates (操作) many kinds of equipment, tools, and machines, which make work easier.
If you made a list of all the jobs performed by the different kinds of energy, you would fill many pages . The need for power increases every day, and some sources of energy【50】So scientists and technicians are trying to find new ways to produce power.
A. formed over many centuries from plants.
B. returns it to the earth in the form. of rain or snow.
C. are being used up very quickly.
D. there would be no life.
E. produce mechanical energy and electricity.
F. are being produced everyday.
(46)
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