温度、压强相同的氦气和氧气,其分子的平均平动动能和平均动能有以下哪种关系?()
A.和都相等
B.相等,而不相等
C.不相等,而相等
D.和都不相等
参考答案:B
阅读理解。
Jim is from England. He's eleven. He's a student in a primary school. He lives in China now. His
father is a teacher. He teaches English. His mother is a doctor. She's from Japan. His parents are
very busy. Jim has a sister. She's Mary. She's only six. She likes playing on the swings. At the
weekends they often go to the park. They like watching butterflies dancing in the flowers. It's very
beautiful.
1. Jim's family are _____.
A. British
B. the USA
C. Australia
2. Jim's father is _____.
A. a doctor
B. an English teacher
C. a Maths teacher
3. Mary is _____.
A. a student
B. Jim's sister
C. Japanese
4. Jim's family often go to the park _____.
A. at the weekends
B. on Monday
C. on Friday
5. Jim is a student, and he lives in _____ now.
A. England
B. English
C. China
根据生产的卫生类别,货运量及用地规模,工业在城市中的布置形式主要有( )。
A.布置在离城区附近的工业
B.城市边缘的工业
C.布置在城市内和居住区内的工业
D.布置在远离城区的工业