得至0；获得 v. a_ _ _ _ _ _
得至0；获得 v. a_ _ _ _ _ _
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有如下类定义: class Test { int x_,y_; public: Test ():a_(0) ,b_(0) {} Test(int a,int b=0) :a_(a),b_(b){} }; 若执行语句 Test x(2) ,y[3],*z[4]; 则Test类的构造函数被调用的次数是( )。A．2次B．3次C．4次D．5次
1、与非门的逻辑关系可总结为（）A．有0得0，全1得1B．有0得1，全1得0C．有1得1，全0得0D．有1得0，全0得1