单选题
发布日期:2021-03-22
moisture emulsification of the bearing grease
insufficient circulation and overheating of the bearing
proper grease circulation to cool the bearing
sliding friction between balls and races
标签: pumps pump motors overpacking ball
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以下关于电子文件的收集要求描述,哪个是不正确的?()
男性,63岁。慢性咳嗽、咳痰近20年,每年秋冬发作,至翌年春暖季节方有缓解。偶有痰血。年轻时患肺结核,经异烟肼、链霉素和对氨基水杨酸钠治疗近2年,以后胸片随访为两肺散斑片结节影伴少量纤维条索状病灶。5年前发现高血压病,心电图示左心室高电压。重度吸烟(每日超过40支)已经30余年。本病例慢性支气管炎诊断能否成立有下列不同意见,你认为哪种意见是正确的()
下列哪些人员可以申请小额担保贷款()。
男性不育症的主要原因,但除了()
以下情况标志女性青春期开始的是( )。
短期债务率是指()的百分率。
治疗心室颤动,最有效的措施为()
简述民事裁定和民事判决的区别。
交替脉
基底动脉尖端分出的动脉为()
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