[电学] 开关点保护装置 switch protector: 尖轨保护器pin for extension with point protector: 带针尖护套的牵引针point lightning protector: 尖端避雷器; 尖端放电避雷针; 尖端型避雷器point of switch: 转辙器尖point switch: 转辙机下载手机词典可随时随地查词查翻译