【单选题】热处理是指金属材料在()下,通过加热、保温、冷却的手段,改变材料表面或内部的化学成分与组织,获得所需性能的一种金属热加工工艺。
【判断题】表面热处理是改变材料表面的化学成分,从而改变钢的性能。
【单选题】Why do you think F and Graham are good friends?
A.
They love to share both good and bad moments.
B.
Graham is trying to be the first one to go to the ceremony.
C.
Graham always hopes that he will win the competition.
【判断题】表面热处理是改变材料表面的化学成分,从而改变材料表面的性能。( )
【单选题】According to F, what should a real friend do?
A.
He hopes Graham will do better next time.
B.
He believes that Graham won’t feel as happy as he does for his success.
C.
He is eager to contact Graham to share his own happiness.
【判断题】表面热处理是改变材料表面的化学成分,从而改变钢内部的性能。
【单选题】According to F, what should a real friend do?
A.
He hopes Graham will do better next time.
B.
He is eager to contact Graham to share his own happiness.
C.
He believes that Graham won’t feel as happy as he does for his success.
【单选题】设 j 为 int 型,则下面 for 循环语句结果为( ) for(j=10;j>3;j--) { if(j%3) j--; --j;--j; printf(“%d”,j); }