若锅炉运行中负荷不变，燃烧突然增强，会使汽包水位瞬间下降，而后升高。
参考答案：错
Would you please supply ______ a complete set of catalogues for textile accessories so that we may make choice and work on them.
A．us
B．us with
C．us by
D．us for
《火电厂烟尘排放标准》中允许烟气排放浓度与火电厂年限、除尘器类型、燃烧灰分、烟囱的高度有关
