Where a He-leakage test is required in the Technical Data Sh
Where a He-leakage test is required in the Technical Data Sheet,...这句话中的He-leakage是什么意思啊
整句为:
Where a He-leakage test is required in the Technical Data Sheet,this
test has to follow ASTM E498 (vacuum) or ASTM E499 (pressurising).