乙烯比乙炔质子的相对化学位移要大,主要原因是()。 A.由于磁的各向异性效应,使得乙

题型:单项选择题

问题:

乙烯比乙炔质子的相对化学位移要大,主要原因是()。

A.由于磁的各向异性效应,使得乙烯、乙炔质子都处在屏蔽区

B.由于磁的各向异性效应,使得乙烯、乙炔质子都处在去屏蔽区

C、由于磁的各向异性效应,使乙烯质子处在去屏蔽区,乙快质子处在屏蔽区

D.由于磁的各向异性效应,使乙烯质子处在屏蔽区,乙快质子处在去屏蔽区

考点:生化化工药品技能考试仪器分析工(中级)仪器分析工(中级)题库
题型:单项选择题

心尖区触及舒张期震颤,最可能的是()

A.二尖瓣狭窄

B.二尖瓣关闭不全

C.动脉导管未闭

D.室间隔缺损

E.主动脉瓣狭窄

题型:单项选择题

Angela Chang(张韶涵) didn’t know it would be so hard to turn singing into a career. She went to many different record companies. But she was always turned down for looking too young and small.

“I’d never had such difficulties before,” Chang said. But Chang’s talent was finally accepted in 2002. When she got a piece of work, she cried.

She soon became a star. Her first album Over the Rainbow sold very well. She won many awards.

“You wouldn’t believe such a beautiful voice could come from such a small body,” said one musician after hearing Chang sing. “She has a special voice. You can’t forget it.”

But the 25-year-old girl has other talents too. Chang is also an actress. She has played a role in the popular TV plays, My MVP Valentine and At Dolphin Bay. Many people remember her common-girl parts in the plays. But acting is difficult. Chang once acted so badly that she was nearly fired. Another time it took her 27 tries to get a scene right.

“I cried when I got back home,” Chang said. “But I knew that I wouldn’t always fail. You only fail when you give up.”

Now with four albums behind her - Over the Rainbow, Aurora, Pandora and Flower in the Wonderland, it’s clear that Chang and music were made for each other. As she sings in one song, “I have a pair of invisible wings. They fly me to the sky and give me hope.”

小题1:The word “invisible” in the last paragraph means “________________”.

A.难以相信的

B.看不见的

C.隐藏的

D.暗的小题2: Many record companies refused to co-operate(合作) with her because ______________.

A.she looks very common

B.she is too young

C.she doesn’t sing very well

D.she looks young and small小题3: Which of the following is NOT right?

A.She won many awards for the album Over the Rainbow.

B.She has made four films.

C.One musician spoke highly of her.

D.She is not only a singer but an actress.小题4:Although acting is difficult for her, she never gives up because ______________.

A.she is strong-minded

B.people like her films

C.she is interested in acting

D.she acted in the popular TV plays小题5:Which do you think is the best title of the passage?

A.The Small Girl.

B.Four Albums.

C.I have a Pair of Invisible Wings.

D.A Poor Actress.

题型:单项选择题

土中水自上而下渗流时,土中的总应力()。

A.增大

B.减少

C.不变

题型:单项选择题

动力转向器总成的气试时间为(),气试压力为1.5MPa。

题型:单项选择题

造成换向阀工作次序紊乱的原因是()。

A、滑阀被拉毛,油中有杂质,滑阀移动不灵活或卡住

B、滑阀被堵塞

C、阀体变形

D、操作压力不够

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