短语词组短语ball journal bearing 球颈轴承;球颈ball socketed bearing 耳轴轴承ball -bearing cartridge 球轴承座ball reciprocating bearing 可后移滚珠轴承ball shaped bearing 活塞头ball thrust bearing [机]止推滚珠轴承;推力球轴承;滚珠止推轴承;滚珠推力轴承 返回 ball bearing