题目内容

下列表面活性剂中,属于离子表面活性剂的有()。

A. 肥皂类
B. 泊洛沙姆
C. 苯扎氯胺
D. 卵磷脂
E. 吐温80

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表面活性剂之所以能降低表面张力,是由其结构特征决定的。()

A. 对
B. 错

新洁尔灭为常用的阴离子型表面活性剂。()

A. 对
B. 错

Listentothepassageagainandfillintheblankswithwhatyouhear.[音频]Reasonsfor homeschoolingSomeparentsworrythattheirchildren1) ____________ inschoolbecauseof schoolbullying.Someparentswanttheirchildren‘seducationtobebasedontheir 2) ____________________.Someparentsfeelschooleducationis3)________________________.Homeschoolingisachoiceforfamiliesthat4) ______________________ orthatoften travel.Waysof homeschoolingHomeschoolingallowsparentstopersonalizelessonsaccordingtotheirchildren’s needs.Parentscanbuytextbooksor5) _______________________.Someparentsallowchildrentodetermine6) __________________ basedontheir naturalcuriosity.Somefamiliesarrangeagroupofhomeschooledstudentsto7) ___________________________andparticipateinactivitieslikefieldtripsanddancingparties.

当硅二极管加上0.4V电压时,该二极管相当于( )

A. 很小的电阻
B. 很大的电阻
C. 短路
D. 电容

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