实验研究对于其它铸造工艺条件下二次非金属买物的控制亦有一定的参考价值。
This experiment also has reference value to the control of secondary inclusion in other casting process conditions.
形式和尺寸也可以通过其它一些可选工艺来达到，比如热挤出或冷挤出加工，沙模铸造，拉模铸造，或精密铸造。
Form and dimension may also be achieved by a number of alternative processes such as hot or cold extrusion, sand casting, die casting, and precision casting.
上述情况可能由于NGC无法控制的铸造工艺或其它自然条件引起。
Such conditions may be due to the minting process or other natural conditions over which NGC has no control.
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