主风分布管的好坏直接影响流化床的流化质量、（）、和催化剂的损耗。
参考答案：再生烧焦效果
--- Why do you look so upset?
--- ________, I had to take over his work.
A．His being away
B．He was away
C．He had been away
D．He being away
在版面设计中，不断重复使用基本形或线，是经常采用的形式。为了避免呆板稍做一些变化，使版面变得灵活。这种形式原理属于（）.
A、变异与秩序
B、节奏与韵律
C、重复与交错
D、对称与均衡
