下列各有机物物质的量相同,其中碳元素百分含量最高的是()。 A.丙烯 B.丙炔 C.

题型:单项选择题 A1/A2型题

问题:

下列各有机物物质的量相同,其中碳元素百分含量最高的是()。

A.丙烯

B.丙炔

C.丙烷

D.丙醛

E.丙酸

考点:理化检验技术(师)相关专业知识相关专业知识题库
题型:单项选择题 A1/A2型题

阅读理解。

     Boys and girls love to watch TV. Some children spend six hours a day in school and four to six hours

a day in front of a TV set. Some children even watch TV for eight or more hours on Saturday. TV

programmes are like books or films. A child can learn bad things from some of them and good things from

others. Some programmes help children to know the news from other part of the world. Some programmes

show people and places from other countries or other times in history. With TV a child doesn't need to go to

the zoo to see animals or to the sea to see a ship. Boys and girls can see a film, a play or a basketball match

at home. Some programmes can teach children how to cook or how to use tools. It's interesting to watch

TV, but it is also interesting to read a book or to visit friends.

1.Children often watch TV for _____ a day. [ ]

A. four hours

B. four hours to six hours

C. six hours

D. eight or more hours

2. Children can learn _____ things from TV programmes. [ ]

A. good

B. good and bad

C. bad

D. good or bad

3. A child can know _____ from TV programmes. [ ]

A. the news of the world

B. people in the other countries

C. history of other countries

D. all of the above

4. According to the passage, children watch many things except _____.[ ]

A. dogs

B. matches

C. plays

D. books

5. TV can be _____, too. [ ]

A. teachers

B. doctors

C. workers

D. students

题型:单项选择题 A1/A2型题

多项式2x3-x2y2-3xy+x-1是______次______项式.

题型:单项选择题 A1/A2型题

铁路货物运输的局限是受天气的影响。

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当船舶的实际配员低于《船舶最低安全配员证书》的要求时,海事管理机构应当:()

A.对其处以罚款

B.对其处以警告

C.禁止其离港

D.令其改航

题型:单项选择题 A1/A2型题

希望编写好的Java程序代码,应遵守命名规则、______、为代码分段、适当使用空白行、遵循第32条规则。

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