模拟移动床工艺中,产品PX中NA含量高时,应()。
(A)提高精制区回流比
(B)提高缓冲区回流比
(C)精制区、缓冲区都提高
(D)降低缓冲区回流比
参考答案:D
化痰药中,既能化痰,又能止呕的药是____、____等。
A.The man doesn’ t like any of the two coats.
B.The man doesn’ t care which coat he is going to buy.
C.The man likes a different coat.
D.The man wants to choose a coat himself.