英语词汇“外三關”的翻译、意思、用法、释义-英汉汉英双解词典

词汇	外三關
释义	外三關 wài sān guān明代以今河北境内沿外长城的雁门关、宁武关、偏头关为外三关。外三关
随便看	effective thermal efficiency effective thermal efficienecy effective thermal insulation effective thermal resistance effective thermal transmittance effective thickness effective thickness of absorption layer effective thickness of a wall effective thickness of expulsion hydrocarbon Effective thickness of fillet weld effective thickness of wall effective thinking effective thread effective-thread effective thread turns effective threshold energy effective threshold-value effective throad thickness effective throat effective throat thickness effective throat焊缝 effective throughput effective throw effective thrust effective thyroxin