短语词组短语boom swivel bearing 动臂旋转接头轴承;氢氧化钠body swivel bearing 球形止推轴承Frost swivel bearing 霜冻旋转轴承swivel joint roller bearing 轴承3 bearing swivel duct 轴承偏转喷管bearing swivel duct 轴承偏转喷管 返回 swivel bearing