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在静脉输液过程中，如果患者出现了空气拴塞，应立即取_______卧位。

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静脉补钾的浓度为。

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请简述静脉补液的原则。

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Fill in the blanks by selecting suitable words from the word bank.University students come from different parts of the country with various purposes. However, a closer look at their reasons for studying at the university will enable us to 1) ___ them roughly into three groups: those who have a(n) 2) _ for learning, those who wish to 3) _ a bright future, and those who learn with no definite purpose.Firstly, there are many students who learn simply because they 4) _ their goal of learning. Some read a wealth of British and American novels because they are keenly interested in literature. Others sit in front of the computer screen, working on a new program, 5) _ day and night, because they find some computer programs 6) _, and they dream of becoming a "Bill Gates" one day.Secondly, there are students who work hard mainly for a better and more 7) _ future. It seems that the majority of students fall into this group. After admission to the university, they read books after books to 8) _ knowledge from all of the resources which are 9) _ to them, and finally, to succeed in the future job market.Thirdly, there are still some students who learn without a clear goal. They take courses, finish homework, enjoy life on campus, but don't want to 10) ___ anything new or challenging. They have no idea what they will be doing after college. And they may end up with nothing in their lives.

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在展览期间和展览结束后，展览品的各种处置，应符合下列海关规定：

A. 在展览期间，部分展品被境内单位购买的，由主办单位或其代理人向海关办理进口申报、纳税手续。
B. 展览品所有人已申明放弃的一次性廉价物品，由海关变卖后将款项上缴国库。
C. 展览品被其所有人赠送的，受赠人应当向海关办理进口手续，海关根据进口礼品或经贸往来的赠送品的规定办理。
D. 展览品的各种处置如符合海关规定的，还需由主办单位向海关办理核销结关手续。

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