带电作业工具库内加热装置或热风口与绝缘工具表面距离应不少于()cm。 ["20~30","30~50","50~100","100~120"]
减压阀基本上可分为:先导式和()式。 ["A、液动","B、直动","C、电动","D、分流"]
八闽之称起于何时?当时“八闽”具体指哪里?
溢流阀基本上可分为:先导式和()式。 ["A、液动","B、直动","C、电动","D、分流"]
根据《带电作业用工具库房》DL/T974—2005,带电作业工具库相对湿度不大于()。 ["50%","60%","70%","80%"]
请说出夏季压缩机运行时,油温过高如何处理?