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无菌术的内容包括()、()、()及管理制度等
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【简答题】12 填空 is the predominant alloying element of Brass.
【单选题】 Manganese as an alloying element in alloy steels is used principally to
A.
Improve hardenability
B.
Improve mechanical properties at low or elevated temperatures
C.
Improve the corrosion and oxidation resistance
D.
Increase the machinability
【简答题】Describe the mechanisms by which alloying effects affect hardenability.
【单选题】( )是人们在社会交往中由于受历史传统、风俗习惯、宗教信仰、时代潮流等因素的影响而形成,既为人们所认同,又为人们所遵守的。
A.
仪式
B.
礼节
C.
礼貌
D.
礼仪
【简答题】With the exception of , all alloying elements raise the hardenability of steels..
【简答题】Some alloying elements are known a‘carbide formers’.What does this term mean?Beyond this,some elements are called very strong,strong or moderate carbide formers.What is meant by this?
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