题目内容

腰阳关位于()

A. 第一腰椎棘突下
B. 第二腰椎棘突下
C. 第三腰椎棘突下
D. 第四腰椎棘突下
E. 第五腰椎棘突下

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Fill in the blanks with the proper words or expressions given below, changing the form if necessary.keep in touch ;join...with;make it possible ;pros and cons;long for;peace of mind;worry about; friend circle;make smart choices; have a try1) There are _____________ in everything, old or new.2) In this busy world, we need more _____________ .3) Do you always _____________ with your friends home and abroad?4) WeChat _________________ for my mom to show her flowers every day.5) Some people _________ the future but also worry about new changes in their life.6) Running is fun! Why not ___________ ?

Match the name and content of the memo elements.将备忘录各要素名称及内容匹配

Match the main body of the memo with the content description将备忘录主体部分及内容说明匹配

实验中加入三乙醇胺的目的是:

A. 调节pH值
B. 掩蔽铁离子
C. 作缓冲溶液
D. 掩蔽镁离子

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