维护公共程序的基本手段是礼仪
一质点做匀速率圆周运动时,其()
InAugust1977,asatellitetogatherdataaboutthe10millionblackholeswhicharethoughttobeintheMilkyWay.
质量为m的质点在三个外力的作用下运动时,其加速度为a,当撤去其中一个外力F后,质点的加速度a′=______.
Donotletthis__(say)ofyou.Itshowsanunattractiveindifferencetoyouremployerandtoyourjob.