A systematic experimental study has been conducted an mild Steel tubes of various thickness in their perforation by hard steel spheres.
本文通过实验研究了不同尺寸的硬质钢球弹丸对不同壁厚的低碳钢圆钢管的侵彻和穿孔效应；
In this paper, a systematic experimental study of leaching gold have been done on the basis of the study on technological mineralogy of the sulfur concentrate containing gold from Daye Iron mine.
本文在对大冶铁矿含金硫精矿进行工艺矿物学研究的基础上，进行了系统的提金试验研究。
This paper carries on systematic indoor experimental study.
本文进行了比较系统的室内试验研究。
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