短语词组短语bell shaped insulator 铃式绝缘子;钟状绝缘子triple petticoat bell shaped insulator 三裙豌式绝缘子bell shaped suspension insulator 碗形悬挂绝缘子double -bell insulator 双碗形绝缘子bell -shaped suspension insulator 裙式悬垂绝缘子;钟形悬挂绝缘子 返回 bell insulator