中性点非有效接地系统发生单相金属性接地故障时,中性点对地电压U0与接地相的相电压大小相等,反向相反,并等于电网出现的电流（）

A.1/2
B．1/3
C．1/4
D．2/3

A.检查锤
B．拢起的红旗
C．单臂

A、expenditures on durable goods such as automobiles and refrigerators
B、expenditures on intangibles items such as medical care
C、expenditures on new housing
D、All of the above are correct.