当然, 坐标系 ( x, y, z ) 轴向的选择是任意的.The choice of orientation of the ( x, y, z ) coordinate system is, of course, quite arbitrary.除此之外, 具有曲线型齿线之齿轮在运转时亦不会产生轴向的推力.Moreover, a gear pair with curvilinear - tooth traces operates wi...
在新闻部员工中已经在转发一封电子邮件,呼吁大家自愿裁汰.An e-mail is already circulating amongst news staff calling for voluntary redundancies.彼得一关上门就开始逐一查看起邮件来。Peter starts looking through the mail as soon as the door shuts.如有任何疑问，就给我发邮件。If you ha...