In the experiment of liquid viscosity measured by rotary column method, the uniform drop time and distance are calculated theoretically.

通过理论计算得到了“转柱法测液体粘度”实验中砝码下落达到匀速所需要的时间和运动距离。

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The surviving distance of the cryogenic liquid column is defined.

定义了低温液柱的生存距离。

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Base on the analysis of the usual measure column gear teeth distance error, we rebuilt the usual measure way, and design a king of auto measure way for column gear teeth distance error.

在分析了常用的测量圆柱齿轮齿距误差的基础上，对常规的测量方法进行改造，设计了一种自动检测圆柱齿轮齿距误差的方法。

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Instead, this column is about whether such a rollback is technologically practical, and what a reduced-distance ball would play like.

WSJ: Why a Ball Rollback Might Not Fly | Golf Journal by John Paul Newport