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因加入大量电解质使高分子从溶液中沉淀析出的作用称为渗析。
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利用丁达尔效应可以区分溶液和胶体。
Match the words to the definitions. Write the letter A, B, C,....in the brackets after each statement.A.outline B. timeline C. happen to D. deadline E. temptF.focus G. best-selling H. distraction I.procrastinate J. realistic1.a plan for how long you think something will take( )2.showing a practical idea of what you can expect ( )3.a date or time by which you should complete( )4.something that stops you from paying attention to what you are doing( )5.to make someone want to have or do something, even though they know they really should not( )6.the main point of interest or attention( )7.the most important parts of something without details ( )8.to delay doing something that you ought to do, usually because you do not want to do it()9. to do or be something by chance( )10. selling in great numbers( )8.to delay doing something that you ought to do, usually because you do not want to do it ()9. to do or be something by chance()10. selling in great numbers( )
要想进行电子商务活动，以下哪个方面是必须的？
电子商务的概念分为
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