多项选择题

以下是定窑瓷器底款的是（）。

A、官
B、新官
C、尚食局
D、尚药局

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At T= 0 K, no electrons are thermally excited from the donor level to the conduction band. This phenomenon is called the [填空1].

答案： 1、bound state

单项选择题

下面程序的运行结果是（　　）
#include class base{protected: int a;public: base(){ cout<<"0";}};class base1:virtual base{public: base1(){cout<<"1";}};class base2:virtual base{public: base2(){cout<<"2";}};class derived:public base1,public base2{public: derived(){cout<<"3";}};void main(){ derived obj; }
A、0123
B、3120
C、312
D、3012