简述停电更换220KV间隔棒标准化作业时，地面作业人员的职责？
参考答案：
负责本次作业过程的地面辅助工作，配合、协助高空作业人员进行更换间隔棒工作。
His homework _______ at home yesterday evening.[ ]
A. finished
B. was finished
C. has finished
D. will he finished
室外的热水采暖干线应坡向锅炉房，这样有利于热水的运行。
