【单选题】下列几种滚动轴承,主要承受径向载荷的是( )
【单选题】听力原文:(A) They're watching television. (B) There are multiple monitors, (C) They're being arranged. (D) There are shelves full of items.
【单选题】轴在传递动力时、当它主要承受径向载荷时,应选用() 类轴承,如();当它同时承受径向载荷和轴向载荷时,应选用()类轴承,如()轴承
B.
向心推力轴承;圆锥滚子轴承;向心轴承;深沟球轴承
C.
向心轴承;深沟球轴承;向心推力轴承;圆锥滚子轴承
【判断题】缺乏维生素A会导致夜盲症,皮肤干燥、干眼病
【单选题】最适用于实力不强的中小企业采用的竞争策略是( )。
【单选题】The ( ) monitors engine RPM.