污油回炼接在分馏系统（）和（）线上。
参考答案：一中返塔；富吸收油返塔
非地带性草地主要有哪几类？其形成和分布的因素有哪些？
Why is he always forcing his daughter to practice playing the piano if she is not __________ a pianist?
A．meant
B．intended
C．trained
D．asked
