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请问要求退让性好和吸湿性差的砂芯要用哪种砂做?刚玉基水溶性型芯可以吗?
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2020-08-31 15:44
请问要求退让性好和吸湿性差的砂芯要用哪种砂做?刚玉基水溶性型芯可以吗?
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2020-08-31 15:44
最好是酒精涂料数字砂芯。
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