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【单选题】
为提高灰铁的表面硬度和耐磨性，采用（）的热处理方法效果较好。A.
渗碳淬火后加低温回火
B.
电接触加热表面淬火
C.
等温淬火
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】This is by far ______movie that I have ever seen.
A.
an inspiring
B.
a much inspiring
C.
the most inspiring
D.
the more inspiring
【简答题】简述X62W万能铣床的转换开关SA3和SA5的作用。
【简答题】This is by far movie that I have ever seen. A．an inspiring B．a more inspiring C．the most inspiring D．a much inspiring
【单选题】The toy store needs ______ staff over the holiday season, as this is by far its busiest time of the year.
A.
adding
B.
additive
C.
additional
D.
additionally
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