制冷系统中热力膨胀阀选得太大,会使()。A.蒸发压力太高 B.装置制冷量太大 C.膨

题型:单项选择题

问题:

制冷系统中热力膨胀阀选得太大,会使()。

A.蒸发压力太高

B.装置制冷量太大

C.膨胀阀工作不稳定

D.压缩机吸气过热度太低

考点:海船船员考试船舶制冷装置船舶制冷装置题库
题型:单项选择题

一个空瓶的质量为400克,在装满水后二者的总质量为800克;当装满油后的总质量为720克,求油的密度是多少?

题型:单项选择题

让用户以轮流共享方式使用网络资源,避免某个用户长时间独占传输线路的网络技术是( )

A.分组交换技术
B.数据共享技术
C.分时系统技术
D.随机系统技术

题型:单项选择题

There are many kinds of friends. Some are always (1) you, but don’t understand you. Some say only a few words to you, but understand you. Many people will step in your life, but only (2) friends leave footprints.

I shall always recall the autumn and the girl with the (3) . She will always bring back the friendship between us. I know she will always be my best friend.It was the golden season. I could see the yellow leaves (4) with the cool (5) . In such a season, I liked walking alone on the roads covered with leaves, (6) to the sound of them.Autumn is a (7) season and life is uninteresting. The free days always get me (8) . But one day, the sound of a violin (9) into my ears like a stream flowing in the mountains. I was so surprised that I jumped to see what it was. A young girl, standing in the wind, was (10) in playing her violin.

I had (11) seen her before. The music was so nice that I listened quietly. Lost in the music, I didn’t know that I had been (12) there for so long but my existence did not seem to disturb her.Leaves were still falling. Every day she played the violin at the comer of the building (13) I went downstairs to watch her performance. I was the only listener. The autumn seemed no longer lonely and life became (14) . (15) we didn’t know each other, I thought we were already good friends. I believe she also loved me.Autumn was nearly over. One day, when I was listening carefully, the sound suddenly (16) . To my astonishment, the girl came over to me.

"You must like music from the violin." she said."Yes. And you play very well. Why did you stop’." I asked.Suddenly, a (17) expression appeared on her face and I could feel something unusual."I came here to see my grandmother, but now I must leave. I once played very badly. It was your listening every day that (18) me. " she said."In fact, it was your playing (19) gave me a meaningful autumn," I answered, " Let’s be friends. "The girl smiled, and so did I. I never heard her play again in my life. I no longer went downstairs to listen to her. Only thick leaves were left behind. But I will always remember the fine figure of the girl. She is like a (20) —so short, so bright, like a shooting star giving off so much light that makes the autumn beautiful.

 

第(15)空应选择()

A.But 

B.However 

C.Even 

D.Though

题型:单项选择题

车体钢结构损伤到一定程度后,会降低货车的()性能

A.质量

B.装载

C.运用

D.结构

题型:单项选择题

亚硝基脲类抗肿瘤药

A.卡莫司汀
B.噻替哌
C.罗格列酮
D.米非司酮
E.阿司咪唑

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