This found that if the reverse idea of the electron charge-mass ratio as a known quantity, it can re-theoretical derivation, and thus obtain the value of the vacuum in the speed of light.
笔者发现，如果进行逆向构思，把电子的荷质比作为已知量时，可重新进行理论推导从而得到真空中的光速值。
Based on the tests and theoretic derivation, skeleton curve of restoring force model of frame column with high axial compression ratio is got.
在试验研究和理论推导的基础上，给出了高轴压比下框架柱恢复力模型的骨架曲线，与试验骨架曲线吻合较好。
It is pointed out that in many textbooks, the derivation of the theorem that the ratio of heat to temperature amounts to zero in any reversible cycle is insufficiently exact and too excessively brief.
关于任一可逆循环热温比之和为零的推导，许多教材上的阐述存在着不够准确和过于简单的问题，本文提出一种比较严格的推导方法。
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