赖氨酸为碱性氨基酸,已知pKa1=2.18pKa2=8.95pKa3=10.53则赖

题型:单项选择题

问题:

赖氨酸为碱性氨基酸,已知pKa1=2.18pKa2=8.95pKa3=10.53则赖氨酸的等电点pI为()。

A.5.57

B.6.36

C.9.74

D.10.53

考点:食品科学技术蛋白质蛋白质题库
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如图所示,若甲、乙均为电压表时,闭合开关S,则两电压表的读数U:U=3:2。若甲、乙均为电流表时,断开开关S,两电流表的读数为I:I=        ,R1:R2=        

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短文改错。

     假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文。

文中共有10处语言错误,每句中最多有两处。每处错误仅涉及一个单词的增加、删除

或修改。

     增加:在缺词处加一个漏字符号(∧),并在其下面写出该加的词。

     删除:把多余的词用斜线(\)划掉。

     修改:在错的词下划一横线,并在该词下面写出修改后的词。

     注意:1.每处错误及其修改均仅限一词;

                 2.只允许修改10处,多者(从第11处起)不计分。

Good morning, everyone,

     It's great honor for me to speak here. My name's Li Xiaojun, born of a harmonious family. My father

and mother are all high school teachers.Influenced by them, I read widely during my early age, but I've

developed a great interest in arts and sports. I'm easygoing, get along well with my classmates.

     It is this personality which helps me win over all my classmates' friendships, and also help me

overcome many difficulties both in academic and personal life. Being admitted in your university has

always been a beautiful dream for me. I dream constantly that I, long with mine classmates, will study

happy with the help of the respectable professors; I dream that I will swim freely in the sea, enjoying the

waves of knowledge.

     I hope all my dream will come true in the near future.

     Thank you.

_______________________________________________________________________________

题型:单项选择题

一切时

题型:单项选择题

根据中文意思,完成下列句子,词数不限。

小题1:直到上周三同学们才决定去哪儿度假。

小题2:由于森林的失去, 野生生物的数量正日益减少。

小题3:当地政府已经为贫困儿童提供药品和栖息地。

小题4:我们老师总是鼓励我们不要轻易改变想法。

小题5:他们将积极采取行动阻止人们污染环境。

题型:单项选择题

维修电工在地下室、厨房等潮湿场地工作,或在上、下夹层工作时应如何注意事项?

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