离子型表面活性剂根据离子的种类,可分为阳离子、阴离子和两性表面活性剂。( ) 发布时间:2018-06-08 13:25 │ 来源:www.tikuol.com 题型:判断题 问题: 离子型表面活性剂根据离子的种类,可分为阳离子、阴离子和两性表面活性剂。( )
题型:判断题 The other day,as she waited for the medical report from the doctor,her nervousness _________. [ ]A. has grown B.is growing C. grew D. had grown 查看答案
题型:判断题 The Chinese river dolphin is one of the First-Grade State Protection animals, a (an) mammal with its name – water panda.A.rareB.officialC.extremeD.universal 查看答案