有以下程序 #include＜iostream＞ #include＜string＞ using namespace std； class base { private： charbaseName[10]； public： base() { strcpy(baseName,"Base")； } virtual char*myName()return baseName; } char *className() { return baseName; } }; class Derived: public base { private: char derivedName[10]; public: Derived() { strcpy(derivedName,"Derived"); } char *myName() { return derivedName; } char *className() { return derivedName; } }; void showPtr(base &p) { cout＜＜p.myName0＜＜" "＜＜p.className(); } int main() { base bb; Derived dd; showPtr(dD) ; retum 0; } 动行后的输出结果为

A．Derived Base

B．Base Base

C．Derived Derived

D．Base Derived

某简支梁桥某一级加载后，0L和L处的沉降分别为0.60mm和0.40mm，L/4处的挠度值为2.50mm，则修正后挠度值为（）。

A.2.00mm

B.1.90mm

C.2.10mm

D.1.95mm