加热炉炉管管壁温度升高的处理方法有（）
A、调整各个火嘴的燃烧情况
B、减少燃烧燃料
C、停炉检查
D、开大烟道挡板
参考答案：A
There are ________ approaches to English teaching.But not all of them are equally efficient for
our Chinese students. [ ]
A. variety
B. accurate
C. original
D. diverse
硬膜外给药后药液扩散停止需（）
A.5min
B.10min
C.15min
D.20min
E.25min
