二次飞扬
参考答案：
在干式电除尘中，沉积在收尘极上的粉尘如果粘力不够，容易被通过电除尘器的气流带走，这就是通常所说的二次飞扬。
志贺菌感染后，抗感染免疫主要依靠肠道黏膜表面的（）
A.sIgM
B.IgG
C.sIgG
D.SIgA
E.IgE
基本语法
1. The American players are (更强壮）than the Asian players.
2. In fact the sun is (大得多) than the moon.
3. This kind of basketball is (最贵的) in our shop.
4. This computer is (与……不同) those ones.
5.-Did you two go to the same school?
-Yes ,he went to (同一所学校) as I did.
