Main material for installing: all kinds of channel steel, Angle iron and plate iron.
安装主要材料：各种型号的槽钢、角铁及铁板。
And study how to choose blasting incision Angle with material mechanics.
运用材料力学理论，初步研究了烟囱爆破切口角的选取。
And study how to choose blasting incision Angle with material mechanics.
运用材料力学理论，初步研究了烟囱爆破切口角的选取。
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