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【多选题】
下列对社区体育服务概念含义解释正确的是?A.
互助性和福利性；
B.
服务对象是全体成员；
C.
满足人们的交往、联络感情的精神生活需求；
D.
应用体育的原理方法开展工作；
E.
主要途径有健身锻炼和娱乐休闲活动。
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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.
【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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