离心机有哪些主要作用?

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问题:

离心机有哪些主要作用?

考点:钻探工考试钻探工考试题库
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肺炎患儿发生心力衰竭时,下列哪项措施错误()

A.立即开放静脉通道,快速补液

B.静脉推注毛花苷C

C.控制液体入量

D.取半卧位,床头抬高15°~30°

E.严密观察生命体征

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升麻与葛根的功效是()

A.解表

B.利咽

C.透疹

D.明目

E.解毒

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There was a gardener who looked after his garden with great care. To water his flowers, he used two buckets. One was a shiny and new bucket. The other was a very old and dilapidated one, which had seen many years of service, but was now past its best.

Every morning, the gardener would fill up the two buckets. Then he would carry them along the path, one on each side, to the flowerbeds. The new bucket was very proud of itself. It could carry a full bucket of water without a single drop spilled (溢出). The old bucket felt very ashamed because of its holes: before it reached the flowerbeds, much water had leaked(漏水) along the path.

Sometimes the new bucket would say, “See how great I am! How good it is that the gardener has me to water the flowers every day! I don't know why he still bothers with you. What a waste of space you are!”

And all that the old bucket could say was. “I know I am not very useful, but I can only do my best. I am happy that the gardener still finds a little bit of use in me, at least.”

One day, the gardener heard that kind of conversation. After watering the flowers as usual, he said, “You both have done your work very well. Now I am going to carry you back. I want you to look carefully along the path.”

Then the two buckets did so. All along the path, they noticed, on the side where the new bucket was carried, there was just bare(光秃秃的)earth; on the other side where the old bucket was carried, there was a joyous row of wild flowers, leading all the way to the garden.

小题1:What does the underlined word “dilapidated” probably mean?

A.dirty

B.dark

C.dusk

D.broken小题2:What was the old bucket ashamed of?

A.His leaking.

B.His aging.

C.His manner.

D.His past.小题3:The new bucket made conversations with the old one mainly to   _________.

A.show off its beautiful looks

B.feel sorry about the old one

C.laugh at the old one

D.praise the gardener’s kindness小题4:Why was the old bucket still kept by the gardener?

A.Because it was used to keep balance(平衡)

B.Because it stayed in its best condition

C.Because it had its own value

D.Because it was treated as a treasure

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根据《放射性同位素与射线装置安全许可管理办法》,申请领取许可证的辐射工作单位从事下列活动,应当组织编制环境影响报告表的是()。

A.制备PET用放射性药物的

B.销售Ⅰ类、Ⅱ类、Ⅲ类、Ⅳ类放射源的

C.医疗使用Ⅰ类放射源的

D.生产、销售、使用Ⅱ类射线装置的

E.使用Ⅱ类、Ⅲ类、Ⅳ类放射源的

题型:问答题 简答题

执行如下命令序列后,最后一条命令的显示结果是______。DIMENSION M(2,2) M(1,1)=10M(1,2)=20M(2,1)=30M(2,2)=40 M(2)

A.变量未定义的提示

B.10

C.20

D..F.

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