【单选题】We grease the bearings of all pumps at intervals.我们定期给所有泵的轴承加牛油 01010038
A.
We grease the bearings of some pumps periodically.
B.
We grease the bearings of several pumps periodically.
C.
We grease the bearings of only one pump periodically.
D.
The bearings of all pumps are greased periodically.
【单选题】为防止前置胎盘病人继续出血,禁止做( )
【单选题】The crankpin bearings are made of ( )
【单选题】患者,G1P0,妊娠34周,无明显诱因突发生阴道流血”,入院就诊,诊断为“前置胎盘”。前置胎盘病人禁止做下列哪项检查
【判断题】力的可传性原理只适用于刚体,而不适用于变形体。
【单选题】第四节 前置胎盘 1. 关于 前置 胎盘病人的护理,下列叙述错误的是 ( )
【单选题】On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by _____.
【简答题】Radial bearings are designed to pr movement of the rotating shaft; axial bearings, often called thrust bearings, are designed to pr movement of the shaft.
【单选题】下列说法错误的是( )
A.
刚体受三个力作用而平衡时,此三力作用线共面且汇交于一点
C.
作用力与反作用力总是大小相等、方向相反、作用线相同。