绝缘子 / 串 Insulator/String 导线单联耐张串 Single Tension String for One Conductor 7 32 9 7 I 0; 绝缘子 串 / 单导线双联耐张串 Duble Tension Strings for One Conductor 7 2* 7 . < 32 95 . 7 /; 228