在一般情况下，库仑定律是电荷的产物，和q2之间的距离就是半径r，q1q2，divided，by，their，separation，，which，is，r。,为了使最后算出的合理的静电单位和力学单位,我们需要在这儿引入一个常数。

So, in the most general form, Coulomb's law is the product of the charge, q1 And, in order to rationalize electrostatic units with mechanical units, we have to put a factor in here.

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而在量子力学术语中，“点粒子”即为“基本粒子”（迄今还未发现有用来构成基本粒子的更小单位）。

In the parlance of quantum mechanics, however, to call a particle pointlike is to say no more than that it is elementary, ie, that it is not known to be made up of smaller bits.

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本文建立了辊筒磨的力学模型，探讨了辊筒磨对物料的粉碎力、以及物料钳角、单位质量能耗等问题，并通过实验进行了验。

The paper set up mechanics model of roll cylinder mill, inquired into crushing stress of materials by mill and materials clamp Angle and energy requirement problems.

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