问题
问答题 简答题
何谓脂质体？脂质体的组成、结构与表面活性剂胶团有何不同？
答案
参考答案：
脂质体系指将药物包封于类脂质双分子层（厚度约4nm）内而形成的微型囊泡，也有人称脂质体为类脂小球或液晶微囊。脂质体的组成、结构与表面活性剂构成的胶束不同，后者是由单分子层组成，而脂质体是双分子层组成。磷脂是脂质体的膜材，是脂质体的主要组成部分。
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何谓脂质体？脂质体的组成、结构与表面活性剂胶团有何不同？
参考答案：
脂质体系指将药物包封于类脂质双分子层（厚度约4nm）内而形成的微型囊泡，也有人称脂质体为类脂小球或液晶微囊。脂质体的组成、结构与表面活性剂构成的胶束不同，后者是由单分子层组成，而脂质体是双分子层组成。磷脂是脂质体的膜材，是脂质体的主要组成部分。
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| It was Sunday afternoon. My brother and I were alone at home. My parents went for a party and asked me to look after my brother. I was doing my homework while my younger brother was watching TV. Suddenly the doorbell rang. Ding Dong! My brother thought that it was our parents, so he opened the 1 quickly. A tall man wearing a black raincoat stood outside. He said that he came to sell books and asked politely 2 our parents were at home. Without thinking, my brother said, "No." Then the man asked if we would like to 3 some story books. I refused him. When I wanted to close the door, he suddenly pushed the door very 4 and came into our house. He took out a 5 and ordered me to tie up my brother's hands with a rope. I tied up his hands in a special way so my brother could untie 6 easily. The man then tied my hands up and locked 7 of us in the kitchen. Soon, he went upstairs to 8 money. I taught my brother to untie the rope on his 9 He then untied me. I rushed to the telephone to call the police, 10 the line was dead. The doors were all locked from the outside. It was lucky that the man 11 to lock the kitchen window. We got out of the house through the kitchen window and went to the 12 pay phone to call the police. Soon _ 13 _ came to our house and the man was caught. By that time, my parents had come home. We told them the whole story. My parents were _ 14 _that we were not hurt. They told me that I should stop my brother from 15 the door to strangers. I learnt a lesson on safety. | ||
| ( )1.A. window ( )2.A. if ( )3.A. lend ( )4.A. politely ( )5.A. book ( )6.A. himself ( )7.A. none ( )8.A. look at ( )9.A. feet ( )10.A. and ( )11.A. wanted ( )12.A. farthest ( )13.A. my friends ( )14.A. glad ( )15.A. opening | B. door B. why B. borrow B. slowly B. knife B. myself B. neither B. look after B. hands B. so B. remembered B. nearest B. the police B. angry B. cleaning | C. book C. when C. buy C. hard C. gift C. herself C. both C. look for C. neck C. but C. forgot C. largest C. my parents C. sad C. locking |