词汇	vacuum tightness
释义	vacuum tightness 真空密闭
随便看	hand-held passive night viewer Hand-held patrol instrument handheld pc hand-held perforating apparatus hand held perimeter hand-held perimeter handheld personal computer hand-held personal computer handheld photometer hand-held pointer hand-held portable data encryption device hand held portable electric tool hand-held portable electric tool hand-held portable radio hand held power tool hand-held power tool handheld probe hand held probe hand-held probe hand-held punching apparatus hand-held radio hand held radioisotope minimonitor hand-held radioisotope minimonitor hand-held radiophone handheld reading meter device