概述；真空管道连接件?■DND1D2L标准10161220/70GB4982-85ISO-KF16201620/7025302620/7040454120/7050545020/70?■DNLL1标准164040GB4982-85ISO-KF255050406565507070?■DNLA标准168040GB4982-85ISO-KF251005040130655014070?■DNA标准1040GB4982-85ISO-KF165025654070?CONSTRUCTION FIGHTS（mm）?■DNBB1HE标准10/1645611622GB4982-85ISO-KF20/25557217.53232/407090184750951232561?■DNDN1AA1标准25163535GB4982-85ISO-KF4016404550165050?■DNDN1标准2516GB4982-85ISO-KF4016402550255040?■DNL标准162505007501000GB4982-85ISO-KF252505007501000402505007501000502505007501000?■DNL标准1680GB4982-85ISO-KF2510040130??■DNdH标准10305GB4982-85ISO-KF16305254054055550756