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We’re going to have interesting ___11____in the school library at 8:00 am on November 20,2002. By then, some of us will read ___12____and some will tell stories. You can also hear ___13____singing and watch beautiful dancing there. We hope all the senior students can come and ___14____the activities. All the headmasters will be ___15____to our activities as representatives of teachers. Please get one performance ready because some of you will probably be asked to give us one.

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16 . What is the question the speaker tries to answer?How to ____________________________________________in a job interview .17.What is the most important thing for a job interview?To arrive _____________________________________.18.Why shouldn’t you be nervous?Because it may affect your _________________________________.19.Why does the speaker think being confident in a job interview is also important?Because it can bring you to _________________________.20.What is the last piece of advice from the speak?Be honest about yourself and never tell ________________________.

样品完成高效液相色谱分析,在关机前必须进行

A. 过滤
B. 脱气
C. 平衡
D. 色谱柱清洗
E. 程序设置

HPLC流动相在装入储液瓶之前必须经过滤膜

流动相在使用之前必须经过处理,目的是除去其中溶解的气体

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