標(biāo)準(zhǔn)檢漏孔

-8量級的標(biāo)準(zhǔn)漏孔（氦氣）國家標(biāo)準(zhǔn)計(jì)量單位計(jì)量并出具檢定證書檢漏儀漏率的檢測標(biāo)準(zhǔn)標(biāo)準(zhǔn)漏孔可分：內(nèi)置、外置。-8 magnitude standard leak holes (He)National Standard Unit of Measurement and CertificationStandard for Detecting Leakage Rate of Leak DetectorSta......