问题 问答题 简答题

竖炉与带式焙烧机的优缺点?

答案

参考答案:

优点:竖炉:设备简单,对材料无特殊要求,操作方便,热效率高。

带式机:全部工艺在一台设备上完成,简单可靠,操作维护方便,热效率高,单机生产能力大。

缺点:竖炉:单机生产能力小,加热不均匀,适应性差。

带式机:需用耐热合金钢较多。

阅读理解

Taking part in charity is not just for adult people. Kids can do it too! Melvin Sheppard, 14, an American student, has done charity work for 8 years. He has also encouraged his classmates to join him.

Melvin studies at William Allen Middle School in Philadelphia. Recently, he collected $ 1,500 by himself and $487 from his classmates to donate to Cooper University Hospital.

Melvin was born nine weeks premature (早产的) in Cooper University Hospital,  weighing 2.6kg. His father told him how Cooper saved his life, so he feels thankful to the hospital.

Melvin's classmates joined him once they found out about his kind behavior. Their teacher, Michael Bemer, also held a class with them about helping others. "It wasn't really about the money," Bemer said.  "It was about the fact that they were doing something good."

"It feels great, helping someone that I know." said Jordan, Melvin' s classmate. Melvin's neighbors also helped out.

Since Melvin was 6, he and his parents have given money to Cooper University Hospital every year. This year, Gray E. Stahl, the head of Cooper's division of neonatology(新生儿科学部门), went to Melvin's school to accept the money.

The money goes to a part of the hospital that helps about 500 young patients every year.

"When they leave, we call them graduates," Stahl said, "my co - workers and I are pleased when our graduates and their families do well, like Melvin and his family."

小题1:When did Melvin start to do charity work?

A.When he was 14 years old.

B.When he was 8 years old.

C.When he was 6 years old.

D.When he was born.小题2:Why did Melvin donate to Cooper University Hospital?

A.He was a doctor in Cooper University Hospital.

B.His father worked in Cooper University Hospital.

C.He was thankful to Cooper University Hospital.

D.He used to volunteer in Cooper University Hospital.小题3:Where did Gray E. Stahl accept the money?

A.At Melvin's school.

B.At Melvin's house.

C.At Cooper University Hospital.

D.At Cooper's division of neonatology.小题4:Which of the following is TRUE?

A.Many college graduates accept the money every year.

B.The money helps about 500 0ld patients every year.

C.Melvin does the charity work alone for many years.

D.Melvin's teacher thinks it is a great thing to learn to help others.

阅读理解

Every year thousands of tourists visit Pompeii, Italy. They see the sights that Pompeii is famous for—its stadium(运动场)and theatres, its shops and restaurants. The tourists do not, however, see Pompeii's people. They do not see them because Pompeii has no people. No one has lived in Pompeii for almost 2 000 years.

Once, Pompeii was a busy city of 22 000 people. It lay at the foot of Mount Vesuvius, a grasscovered volcano(火山). Mount Vesuvius had not erupted(喷发)for centuries, so the people of Pompeii felt safe. But they were not.

In August of AD 79, Mount Vesuvius erupted. The entire top of the mountain exploded, and a huge black cloud rose into the air. Soon stones and hot ash began to fall on Pompeii. When the eruption ended two days later, Pompeii was buried under 20 feet of stones and ashes. Almost all of its people were dead.

For centuries, Pompeii lay buried under stone and ash. Then, in the year 1861, an Italian scientist named Ginseppe began to uncover Pompeii. Slowly,carefully, Ginseppe and his men dug. The city looked almost the same as it had looked in AD 79. There were streets and fountains, houses and shops. There was a stadium with 20 000 seats. Perhaps the most important of all, there were everyday objects, which tell us a great deal about the people who lived in Pompeii. Many glasses and jars had some dark blue colour in the bottom, so we know that the people of Pompeii liked wine. They liked bread too, metal bread pans were in every bakery. In one bakery there were 81 round, flat loaves of bread—a type of bread that is still sold in Italy today.

Tiny boxes filled with a dark, shiny powder tell us that women liked to wear eyemakeup.

Ginseppe has died, but his work continues. One fourth has not been uncovered yet. Scientists are still digging, still making discoveries that draw the tourists to Pompeii.

1.Why do large numbers of people come to Pompeii each year?

A.To visit the volcano.   

B.To shop and eat there.

C.To watch sports and plays.   

D.To see how Pompeiians lived. 

2.Why had so many Pompeiians remained by volcanic Mount Vesuvius?

A.The city nearby offered all kinds of fun.

B.The area produced the finest wine in Italy.

C.Few people expected the volcano to erupt again.

D.The mountain was beautiful and covered with grass. 

3.Why did the city uncovered look almost the same as it had looked in AD 79?

A.Because Ginseppe and his men dug it slowly and carefully.

B.Because the city was buried alive and remained untouched.

C.Because scientists successfully rebuilt the city with everyday objects.

D.Because nobody had lived in the city ever since the volcano erupted.

4.What do we know about the Pompeiians who lived 2 000 years ago?

A.They lived more or less the same as Italians now do.

B.They liked women wearing all kinds of makeup.

C.They enjoyed a lazy life with drinking and eating.

D.They went back to Pompeii after the eruption in AD 79.