The γ phase composition limit and the carbon content width in two phase WC-Co cemented carbides were derived according to the relations among all phases in aloys.
依据WC-Co硬质合金各相含量间的关系,推求出两相(WC+γ)合金中γ相成分极限和碳含量宽度。
STEVE EMBER: The lithographic process was invented in the late eighteenth century by the German writer Aloys Senefelder.
平版印刷工艺是在18世纪末,由一位名叫阿罗斯·塞尼菲尔德的作家发明的。
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