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【多选题】
表面处理技术用于模具表面,可达到如下目的:A.
提高模具表面的硬度、耐磨性、耐蚀性和抗高温氧化性能，大幅度提高模具的使用寿命。
B.
提高模具表面抗擦伤能力和脱模能力，提高生产率。
C.
采用碳素工具钢或低合金钢，经表面涂层或合金化处理后，可达到或超过高合金化模具材料甚至硬质合金的性能指标，不仅可以大幅度降低材料成本，而且可以简化模具制造的加工工艺和热处理工艺，降低生产成本。
D.
可用于模具的修复，尤其是电刷镀技术可在不拆卸模具的前提下完成对模具表面的修复，且能保证修复后的工作面仍有足够的表面质量。
E.
可用于模具表面的纹饰，以提高塑料制品的档次和附加值。
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A.
so very expensive; to buy
B.
too expensive; to buy
C.
as expensive; as to buy
D.
more expensive; buying
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A.
should have said; bought
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have said; bought
C.
had said; buy
D.
must have said; should buy
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