【单选题】在如下图的一个稳压电源电路中,若输入电压升高,请简要概述各元件上的电压如何变化才能维持输出电压基本不变。
【单选题】传染病与感染性疾病的主要区别在于前者具有
【单选题】一产后4天的产妇,有下列主述,何项不是正常的产褥现象
【单选题】The relationship between K a of a weak acid and K b of its conjugate base is ( ).
【简答题】有以下程序: include<iostream> using namespace std; class Base { public: Base() { K=0; } int x; }; class Derivedl:virtual public Base { public: Derivedl() { x=10; } }; class Derived2:virtua1 public Base
【多选题】有以下代码成立,则Base类需要实现的构造方法有: 。 public class check extends Base{ pulbic check(){} public check( int j){super(j); } public check(int j,int k){ super(j,k); } }
D.
Base( int i, int j, int k)
【单选题】如下类说明: class Base{ int k; public: Base(int n){ k=n;} }; class Derived:public Base{ int i; public: Derived(int a,int b); }; Derived 类的构造函数在类外实现,正确的是( )
A.
Derived::Derived(int a,int b):k(a),i(b){}
B.
Derived::Derived(int a,int b):k(a),Derived(b){}
C.
Derived::Derived(int a,int b):Base(a),i(b){}
D.
Derived::Derived(int a,int b):Base(a),Derived(b){}
【判断题】K b is the base ionization constant.
【判断题】038-6 某空间力系由两个力构成,此二力既不平行,又不相交,则该力系简化的最后结果必为力螺旋。( )