合金含量超过3%的合金钢管道焊接后应立即进行()。
A.退火处理;
B.回火处理;
C.正火处理;
D.焊后热处理。
参考答案:D
有如下类定义: class Vechicle //基类 public: Vechicle(string s):name(s) protected: string name; ; //Vechicle的派生类 public: Bicycle(string name):Vechicle( name) ; 横线处缺失部分为______。
A.class Vechicle:public BicycleB.class Bicycle: class VechicleC.class Bicycle:public VechicleD.class Bicycle: public class Vechicle