烟气脱硝系统可用率不低于（）；在催化剂最大装入量的情况下，烟气脱硝系统效率一般应大于（）；使用寿命和检修周期应与发电机组相匹配。
参考答案：99%；80%
My father admitted that when comes to pop music, he had little knowledge of it.
A．he
B．that
C．this
D．it
稳定塔操作平稳要注意哪几方面？
