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【简答题】
下列场合宜采用何种热处理方法(不解释原因) 1 、提高低碳钢的切削加工性能。 2 、降低高碳工模具钢的硬度,以便切削加工,且为最终淬火作组织准备。 3 、为表面淬火工件(要求芯部具有良好的综合机械性能)作组织准备。 4 、纠正 60 钢锻造过热的粗大组织,为切削加工作准备。 5 、降低冷冲压件的硬度,提高塑性,以便进一步拉伸。 6 、去除因塑性变形、焊接造成的以及铸件内残余应力。 7 、消除过共析钢中呈网状的二次渗碳体。 8 、消除灰口铸铁的组织,降低其硬度。 9 、为到下贝氏体组织。
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皮皮学刷刷变学霸
举一反三
【简答题】某企业2008年取得销售(营业)收入60000万元，企业为了充分利用税收政策，最理想的业务招待费应该是（ ）万元。
【单选题】Which of the following is the main idea of this passage?
A.
Fire can help people in many ways.
B.
Fire can be both helpful and dangerous.
C.
Fire can bum things and people.
D.
We must be careful with matches.
【单选题】It has been said that fire is a good servant 9 but a bad master. While fire does for us what we want to do 9 nothing can be more helpful. When fire gets beyond our control, nothing is more harmful. Wh...
A.
In fact, fire is both helpful and harmful.
B.
As nothing is more harmful than fire, we'd better get rid of it.
C.
It is advisable for man to have a good servant control the fire.
D.
A bad master will always try to let fire get beyond control.
【单选题】Which of the following is the main idea of this passage?
A.
Fire can help people in many ways.
B.
Fire can be both helpful and dangerous.
C.
Fire can burn things and people.
D.
We must be careful with matches.
【单选题】某企业 2008年取得销售(营业)收入60000万元,企业为了充分利用税收政策,最理想的业务招待费应该是( )万元。
A.
500
B.
300
C.
600
D.
200
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