标准以太网指的是 ( ) A: 10 BASE 5 B: 10 BASE 2 C: 10 BASE T D: 100 BASE T

给出下面的代码段 public class Base{ int x, y; static int z; public Base(int a,int b)<br/>{ x=a; y=b; } } 以下代码错误的是?(). A: Base b=new Base(); <br/>b.z=10; B: Base b=new Base(1,2); <br/>b.z=10; C: Base.z=10; D: Base b=new Base(1,2);<br/>b.x=2;

（6-2）定义如下Base类，能在(1)处正确调用Base的构造方法。 class Base{ int x,y; Base(int x){} Base(int x,int y){ //(1)调用Base的构造方法 } }

以下代码调试结果 class Base {} class Sub extends Base {} public class CEx{ public static void main(String argv[]){ Base b = new Base(); Sub s = (Sub) b; } }

如何能使程序调用Base类的构造方法输出"base constructor"; class Base{ Base(int i){ System.out.println("base constructor"); } Base(){  } } public class Sup extends Base{ public static void main(String argv[]){ Sup s= new Sup(); //One } Sup() { //Two } public void derived() { //Three } }

● 若二维数组arr[1..M, 1..N]的首地址为base，数组元素按列存储且每个元素占用K个存储单元，则元素arr[i, j]在该数组空间的地址为 __ 。 A.base+((i-1)*M+j-1)*K B.base+((i-1)*N+j-1)*K C. base+((j-1)*M+i-1)*K D. base+((j-1)*N+i-1)*K

The composition of<br/>backbone of polynucleotides includes () A: base and pentose<br/>sugar B: base and<br/>phosphate C: base and base D: pentose sugar and<br/>phosphate E: pentose sugar and<br/>pentose sugar

We should always () our opinion () facts. A: base ... in B: base ... on C: basis ... in D: basis ...on

（6-2）以下代码会出现编译错误。 class Base{ public Base () { System.out.println("1"); } public void Base () { System.out.println("2"); } }

When a BJT is operating in the active region, the voltage drop from the base to the emitter VBE is approximately equal to the____ A: base bias voltage B: base current times the base resistor C: diode drop (about 0.7 V) D: emitter voltage