搜题请搜索小程序“爱下问搜题”
问题 填空题

液化气中的主要成分之一是丁烷。在25℃、101 kPa时，10 kg丁烷完全燃烧生成CO2和H2O（l）放出热量5×105kJ，丁烷燃烧的热化学方程式为_______________________________ 。丁烷的燃烧热为_________________。

答案

2C4H10（g）+13O2（g）==8CO2（g）+10H2O（l）ΔH=-5800kJ/mol；2900kJ/mol

报关编码

5-7号燃料油,不含生物柴油
查看答案
单项选择题

D


Doctor Seuss was born in 1904. By the middle 1950s, he had become one of the best-loved and most successful children’s book writers in the world. His books are very popular with young readers. They enjoy the invented words and the pictures of unusual funny animals and plants.
In 1954, Life magazine published(刊登) a report about school children who could not read. The report said many children’s books were not interesting. Doctor Seuss ply hoped to help children and decided to write books that were interesting and easy to read. He used words with the same ending sound, like fish and wish. He did not receive training in art. Yet, he drew the pictures for most of his books.
In 1957, Dr. Seuss wrote The Cat in the Hat. He used less than 230 words to write the book and even a six-year-old should be able to read it. It was a fun story and easy to read. Children loved it. Their parents loved it, too. Today it is still one of the stories they like best. The success of The Cat in the Hat made him want to write more books for children. In 1960, he wrote a book using less than fifty words. The book is called Green Eggs and Ham.
In 1984, Doctor Seuss won a Pulitzer Prize (普利策奖). He was honored for the education and enjoyment his books provided American children and their parents.
He died at the age of 87, but his influence remains. Millions of his books have been sold worldwide. People say his books helped change the way American children learned to read. Yet, his books are loved by people of all ages. Doctor Seuss once said. "I do not write for children. I write for people.\

Which of the following is TRUE according to the passage ( )

A．Doctor Seuss wrote Green Eggs and Ham with over 230 words.

B．Doctor Seuss wrote books only for children in the United States.

C．The Cat in the Hat was written only for six-year-old children.

D．His books provided education and enjoyment for Americans.
查看答案