Try to know something about the clue of the text 了解课文线索 Main points of the text 课文大意 Do some exercises by using the new language points 用新语言点练习 ..
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This text expatiated the craft parameters, technique main points and matters needing attention of anodic oxidation and dye black for aluminium and its alloy.
本文主要阐述了铝及铝合金阳极氧化与染黑色工艺参数、技术要点及注意事项。
Simply introduces the name of the invention, the technical field, the purpose of the invention, technical points, the main use and effect, the full text of no more than 300 words.
简单介绍发明的名称、所属技术领域、发明的目的、技术要点、主要用途及效果，全文不得超过300个字。
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