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情报构成的三个基本要素有哪些？

A. 知识或信息
B. 要经过传递
C. 要经过用户使用产生效益
D. 价值

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文献三要素有哪些？

A. 知识
B. 载体
C. 记录
D. 形态

当膜电位绝对值增大时，称为()；反之，称为（)；细胞在发生去极化后，膜电位再向静息电位方向恢复的过程，称为（)。

Discusswithyourclassmateswhetherthereareanyproblemsinthefollowinglettersandhowyoucanimprovethem.Thencontrastyourimprovedletterswiththeoriginalones.DearSir/Madam:IamveryinterestedinyourproductsafterIvisitedyourstandattheParisTradeExhibitionlastmonth.Iwouldbegratefulifyoucouldtellmethepricesofyourproducts.Besidesstainless-steelcutlery,Ialsorequestaquotationformildsteelsheet,CIFShanghai.Letmeknowyourtermsofpaymentandthetimerequiredfordeliveryafteryoureceivetheorder.Iftermsanddeliverytimearesatisfactory,weshallplaceregularorders.Yoursfaithfully,LindaWang

Discusswithyourclassmateswhetherthereareanyproblemsinthefollowinglettersandhowyoucanimprovethem.Thencontrastyourimprovedletterswiththeoriginalones.DearMs.Wang:Hereisourpricelistformildsteelsheet.Ifyouaresatisfiedwithourpriceandwanttoplaceanorder,letmeknow.Sofar,nocustomerisunhappywithourtermsofpaymentanddeliverytime.Andyouwillbeoneofthem.Ifyouhaveanyquestions,don’thesitatetocontactme.Bestregards,JerrySmith