手提灭火器，扑灭电器火灾时，（），防止触电，以四氯化碳及各类气体灭火器为宜。
参考答案：要保持一定距离
This is the age of more. We have more choice, more consumption, more fun, more competition and more anxiety. We have entered a world of excess and age of over abundance.
为什么尖轨尖端必须与基本轨密贴？
