液压牵引采煤机常用液压马达的形式有()柱塞式、摆线式、单作用径向活塞式和叶片式。
A、斜轴轴向
B、斜盘
C、内曲线径向
D、直盘
E、通轴轴向
参考答案:A, C, E
— There are so many current styles, which one should I choose?
— ________.
A.It’s your opinion
B.I don’t mind
C.It’s all up to you
D.That’ s your decision
有如下程序#include using namespace std;class A{ public:virtual void func1(){cout<<"A1";}void func2(){cout<<"A2";}} ;class B:public A{ public:void func1(){cout<<"B1";}void func2(){cout<<"B2";} } ;int main(){A*P=new B;p->func1(); P->func2();return 0;}运行此程序,屏幕上将显示输出【 】
A.B1 B2
B.A1 A2
C.B1 A2
D.A1 B2