设备接地引下线导通电阻值应小于等于( ),且导通电阻初值差( )。( )

2023-06-22

200mΩ,≤50% $; $300mΩ、≤50%
$; $200mΩ、≤60% $; $300mΩ、≤60%

参考答案:A