Drafting or translating instruction manuals and other documents of machine, such as P&ID's and documents on machine modification.
起草或翻译产品说明书，和产品其他相关文档，比如P&ID’s和产品改进说明等。
The result indicated that: 1. P-RE combination modification can modify both the eutectic Si and primary Si of the hypereutectic Al-Si alloy at the same time.
研究结果表明：1 . P - RE复合变质对过共晶铝硅合金的初晶硅和共晶硅都具有良好的变质和细化作用。
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