在压缩机总进气管前安装有（），用以净化造气工段带来的不洁气体，挡住管线中的各种异物，从而保护压缩机不受损害。
参考答案：进气过滤器
---Of ____ two bags, which one do you think is better?
--- _______ smaller one. I prefer how it looks.
A．the; The
B．the; A
C．a; A
D．a; The
影响食品中兽药残留的因素？
