This has to be on a frictionless surface, and you will see, x when I extend it over a distance x, that you get your force, your spring force that drives it back. 这个必须,是在无摩擦的平面上,现在你能看到,当我将它,拉伸距离,那么这个力,这个弹力,会迫使它回去。
Distance Zero and Distance X(DX) 零距离和X距离
The horizontal distance X between roadway and the edge of its upper pillar is an important parameter for roadway layout in floor strata and adjacent coal seams. 巷道与上部煤柱边缘之间的水平距离X(DX),是底板岩巷和邻近煤层巷道布置的重要参数。
Selection of Horizontal Distance X(DX) Between Roadway and the Edge of its Upper Pillar 巷道与上部煤柱边缘间水平距离X(DX)的选择
Another electrical signal is obtained after processed by circuit, whose frequency is same as the fundamental frequency of actuating signal source, the movement distance x of scale grating can be obtained by detecting the change of phase difference between two electrical signals. 该信号经处理电路后,可获得一个频率与激励信号源的基波频率相等的电信号,检测这两个信号间的相位差的变化,可得到标尺光栅的移动距离x。