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通过将原顶注式浇注系统改进为底返式缝隙浇注系统，从而解决了铝黄铜ＺＨＡｌ６７－５－２－２的氧化夹渣和气缩松的缺陷。
Through the improvement of the original top-pouring system to the bottom-return gap gating system, the aluminum oxide ZHAl67-5-2-2 is solved for the defects of oxidized slag and loose gas.