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举一反三
【单选题】下面对司盘类表面活性剂的描述中，错误的是
A.
是一种非离子型表面活性剂
B.
化学结构为脱水山梨醇脂肪酸酯
C.
实际是一种混合物
D.
亲水性强，为水溶性，常用于增容和乳化
E.
毒性和溶血作用较小
【单选题】关于表面活性剂的叙述中哪一条是正确的
A.
能使溶液表面张力降低的物质
B.
能使溶液表面张力增加的物质
C.
能使溶液表面张力不改变的物质
D.
能使溶液表面张力急剧下降的物质
E.
能使溶液表面张力急剧上升的物质
【单选题】How to Use the Sense of Smell Our sense of smell, which we normally take for granted, is nowadays being increasingly used for purposes which might surprise us if we aware of them. One area in which sm...
A.
3) preferred ______.A. the smell of shoes to that of flowersB. the smell of flowers to that of shoesC. the shoes in the room with purified airD. the shoes in the room with appealing smells