皮皮学，免费搜题
登录
搜题
【单选题】
跨步电压的概念为（）。A.
跨步电压数值和人体与电流入地点的距离以及跨步大小有关。人的跨步一般按0.8m考虑，人体距离电流入地点越远，跨步电压数值越小；当离开电流入地点20m以外时，跨步电压接近于零；越接近，则跨步电压越大
B.
降低跨步电压的措施有：①深埋接地极；②采用网状接地装置，并缩小接地网的间隔；③敷设水平均压带
C.
跨步电压主要产生于接地短路电流，也可能来自雷电流
D.
跨步电压是指人活动在具有分布势位的地面，人的两脚之间所承受的电位差。电流通过接地装置向大地流散时，在大地表面上形成了以电流入地点为中心的分布电位。此时，人走在具有分布电位的地面上，两脚间约一步距离的两点间的电位差即为跨步电压
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】In the English class, our teacher ______ a very good suggestion that each of us can write about a section of this topic.
A.
went along with
B.
kept up with
C.
came up with
D.
put up with
【简答题】 The more I look 1 me, the more self-employment seems to be the way to go for many people. I’m not sure if this is just my 2 or it’s indeed a global phenomenon, so I’d like to discuss it with you. In...
【单选题】Our English teacher, as well as all the students, we can only improve our reading by reading wid
A.
Our English teacher, as well as all the students, ____ we can only improve our reading by reading widely. A．agree that
B.
agrees that
C.
agrees with what
D.
agree what
相关题目：
参考解析：
知识点：
题目纠错 0
发布
