《机械制造基础》帮我做几道题. 1．钢材在进行热锻造时通常要加热到奥氏体区域.(X)2．钢铆钉一般使用低碳钢制作.(∨)3．碳素工具钢一般用于低速的手工工具.（∨）4．可锻铸铁可以锻造加工.（X）5．耐磨钢和铸铁的耐磨机理是一样的.（.
问一道全概率的基础题 P(A1)=P(1人击中)=0.4*（1-0.5）(1-0.7)+(1-0.4)*0.5*(1-0.7)+(1-0.4)(1-0.5)*0.7=0.06+0.09+0.21=0.36.
基础写作.上 Last week，we did a survey among 1600 students about how to get along well with others.Most students believe that honesty plays the most important part.Besides，in order to m.
