Note that sonication was less effective than either helium or vacuum treatment. 注意超聲比通氦或者真空處理的效果要差。
Test certificates must be supplied, showing cast analysis, grain size and that the material has been vacuum treated. 要提供檢測證書(shū)，表明鑄件的分析報告，結晶粒度，并且材料要經(jīng)過(guò)真空處理。
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電信業(yè)務(wù)許可證編號：滬B2-20190700
