The body appears to remain suspended in space if it has no initial velocity relative to the elevator . 如果物体相对于升降机没有初速度的话,这个物体看起来就好象是一直悬在空中不动。
For many given initial velocity, there is one particular angle of departure for which the horizontal range is a maximum . 对于任一给定的初速度,有一特殊的发射角,以此角度发射,水平射程最大。
Effect of contact breakaway muzzle velocity 直流电路触点分离初速度对分断的影响
Feasibility analysis of bullet muzzle velocity test system 弹丸初速测试系统可靠性分析
General specification for muzzle velocity radars 火炮初速测定雷达通用规范