基本解釋[機械工程]球公稱直徑英漢例句雙語例句It's suitable for the small caliber valve nominal diameter: airproof test and strength test of DN15/100 flange type, through-type gate valve, cut-off valve and ball valve etc.適用于小口徑閥門通徑：DN15/100法蘭式、直通式閘閥，截止閥，球閥等閥門的密封測試和強度測試。nominal ball diameter更多例句專業(yè)釋義機械工程球公稱直徑