第2题: [多项选择]关于滤过机制的叙述正确的是( )。 A. 滤过机制主要有介质滤过和滤饼滤过 B. 砂滤棒、垂熔玻璃漏斗滤过属于筛析作用 C. 深层截留作用是指粒径小于滤过介质孔径的固体粒子进入到介质的深层被截留 D. 微孔滤膜和超滤膜滤过属于深层截留作用 E. 滤饼滤过的拦截作用主要由所沉积的滤饼起作用 参考答案:A,C,E 答案解析:[知识点] 滤过
第14题: [单项选择]Questions 11 to 18 are based on the conversation you have just heard. A. Doctor and patient. B. Student and teacher. C. Sales assistant and customer. D. Manager and office clerk. 参考答案:B 答案解析:[听力原文] M: I was wondering if it would be ok for me to miss the next class. I must go to visit a f