The cross-section symbol of the pattern fill is a necessary material marker for the cross-sectional view of the solid object.
填充图剖面符号是机械制图、建筑制图中实体剖视图必不可少的材料标识。
So he concluded that the depth marker the boundary between the solid metal and the liquid core.
所提你提出这个深度是固体金属和液态核的边界。
So he concluded that the depth marker the boundary between the solid metal and the liquid core.
所提你提出这个深度是固体金属和液态核的边界。
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