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用H70造句子,“H70”造句
Inthispaper,themechanismofelectrochemistrycorrosionofthetractorradiatorbrazedwithbrass(H90andH70)andSn-Pbfillermetalwasinvestigated.研究了采用黄铜(H90、H70)和锡铅钎料钎焊而成的拖拉机水箱电化学腐蚀机理...
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