本文提出了一套简单适用的四参数变分波函数，对第三周期元素正常态原子进行了系统计算。
This paper proposed a set of variational wave functions that have four parameters, and it also systematically calculated the normal state atoms for third period elements.
第三部分研究了在氦气作保护气体的情况下，用变极性TIG焊方法焊铝时，焊接电流、电弧电压的变化情况和电弧形态的变化。
The third is, when Al is welded by means of VPTIG method of helium, the changes in current, voltage and arc shape.
第三章研究3维弹性理论分区变分原理。
In chapter 3 partitioned variational principles of 3-dimensional theory of elasticity are researched.
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