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下面程序的运行结果为 #include<iostream.h> class A { public: A( ){cout<<"1";} ~A( ){cout<<"2";} }; class B:public A { public: B( ){cout<"3";} ~B( ){cout<<"4";} }; void main( ) { B

单选题
2021-07-17 20:19
A、仅纵筋达到屈服强度
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C

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