单选题：发电厂、变电所中，屋外高压配电装置的最小安全净距A值是基本带电距离，其他安全净距是以A值为基础得出的，下列哪项安全净距计

题目内容：
发电厂、变电所中，屋外高压配电装置的最小安全净距A值是基本带电距离，其他安全净距是以A值为基础得出的，下列哪项安全净距计算是错误的?（　　） A．B1=A1+750mm
B．B2= A1+30+70 mm
C．C= A1+2300+200mm
D．D= A1+1800mm

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答案解析：

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