--- I’d like to buy a skirt like this.

--- OK. We can buy ________ one than this, but ________ this.

A．a good; not as cheap as

B．a better; as expensive as

C．a better; not as expensive as

D．a better; not so cheap as

当丙烯制冷压缩机停车后，分离系统作紧急停车处理，下列处理正确的是（）。

A．碳二加氢反应器紧急停车

B．脱乙烷塔汽提操作

C．乙烯精馏塔紧急停车

D．脱甲烷塔汽提操作