Radial packing ring as sealing ring for rotating shafts A radial packing ring made of a PTFE compound (I) is claimed. This comprises a sealing lip (24) and a protective lip (23) formed in one piece and with corrugated grooves (32-35) stamped into them in a single operation, at least...
刚才看见一视频,一个女生买了800块钱的东西,但是自助付款的时候只付了23块,我突然想到我18年九月份的时候和大学舍友去逛超市,看到一个紫色的荞麦的特别轻特别舒服的套在脖子上的U型枕,才三块多钱,我就随手...