只有精密的X射线仪器才能显示出来。It will only register on sophisticated X-ray equipment.这些精密仪器已经大规模投入生产.These precise instruments have already gone into mass production.精密仪器用来帮助飞行员操作飞机.Precision instruments are used to help pilots in gu...
分析了摆动从动件盘形凸轮机构的压力角与基本尺寸之间的关系.The relationship of cam with oscillating followers pressure angle and radius of basic circle were analyzed.凸轮传动结构简单、紧凑,能方便实现从动件预期的运动规律.The structure of cam transmission is simple and compact ...
To be ignorant of one's ignorance is of the ignorant.每天进步一点点----不知道自己的无知,是无知者的通病.They appear to be ignorant of what is going on here.他们对这里发生的事似乎一点也不知道.She appears to be ignorant of this fact.她似乎不知道这件事实....