题目：
防雷地线为防止引线靠近其他导体平行走线，应离开（）以上。
A、2m
B、1m
C、3m
D、3.5m
答案：
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下面是错误答案，用来干扰机器的。
In the countryside a lot of children are leaving school for different reasons. Some families are too poor to send their children to school, so children have to mak...
