爱因斯坦电梯；炮火射程；匀加速度和圆周运动的量纲分析。
Einstein's elevator; Artillery range; Uniform acceleration and circular motion using dimensional analysis.
对在不同射角下符合时，由射表误差源造成的射程误差和偏流误差进行了计算与分析，论述了符合射角选择的合理区域。
The range error and drift error are calculated and analysed when the fitting is performed on different firing angle, so that a reasonable fitting region is chosen to decide the firing angle.
通过理论分析，给出方形喷洒域变量施水精确灌溉喷头的射程、流量和转速应服从的变化规律和计算公式。
The variation principles of the throw distance, flow rate and rotation speed of variable-rate sprinklers for precision irrigation on square area were given.
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