现网定义的统计周期多数为()分钟,部分实时性较高的统计,统计周期定义为()分钟。
参考答案:60、15
Both you and I _____ wrong.[ ]
A. was
B. am
C. were
D. is
如果裂解炉对流段呈兰雾状,而炉膛底部清晰,则可能的原因是什么?如何处理?