环面可由矩形把其两对对边分别重叠起来而得到.A torus can be obtained from a rectangle by identifying opposite sides.所以就拓扑学而言, 球和环面是不同的东西.Topologically, then, a sphere and a torus are distinct entities.平面包络环面蜗轮副具有优良的啮合性能,它是一种具有广阔应用前景的传动形式.Worm ...
比赛四十九秒钟后,赛跑选手抵达了中点.The runners reached the halfway mark in the race after 49 seconds.碳酸滴定中点和等量点也高得多.The midpoint and equivalence point for carbonic acid are much higher.在两壁间的中点永远找不到粒子.The particle is never to be found ha...
In X - ray fluorescence, pieces of the filter are used directly.在 X 射线荧光法中, 可直接使用滤纸.The dashboard itself is divided into three vacuum Fluorescence Displays.仪表板本身化分为三个真空荧光显示器.In many atomic fluorescence applications a non...