循环冷却水的微生物控制中，化学处理所用的药剂，可分为（）等。

A. 3

B. 4

C.5

D.编译错误

E.6

以下程序的输出结果为:

public class test {

public static void main(String args[]) {

int s=0;

for (int k=0;k<=10;k++)

s+=method(2,k)-1;

System.out.println(s);

}

public static int method(int n,int m) {

if (m==0)

return 1;

else

return n*method(n,m-1、;

}

}

A. 2048

B. 1024

C. 2036

D.2000

分析并给出下列程序的运行输出结果： class Shape { private static int i; protected static int j=10; Shape () { System.out.println ("i = " + i + ", j = " + j); j = 5; } private static int x1 = printInit("private Shape.x1 initialized"); static int printInit(String s) { System.out.println (s); return ++i; } } public class Circle extends Shape { int k = printInit("Circle.k initialized"); public Circle () { System.out.println ("k = " + k); System.out.println ("j = " + j); System.out.println ("x2 = " + x2); super.printInit("super"); } public static int x2 = printInit("public Circle.x2 initialized"); public static void main(String[] args) { System.out.println ("Circle constructor"); Circle b = new Circle (); System.out.println ("b.k="+b.k); } }

【分录题】（4-3）写出以下程序运行结果。 public class Demo05 { public static void main(String[] args) { int temp = 0; int[][] arr = { { 3, 4, 5 }, { 7, 8, 2 }, { 1 }, { 6, 2, 8 } }; for (int[] list : arr) for (int x : list) { if(x>3) temp += list.length; } System.out.println(temp); } }

3下列程序段运行的结果为()。 public class Test{ static void print(String s,int i){ System.out.pdntlnC String: "+s+",int:"+i); } static void print(iht i,String s){ System.out.prinflnCint:"+i+",gtring:"+s); } public static void main(String[] args){ print(99,"Int first"); } }

A．String:String first,int: 11

B．int: 11,String:Int first

C．String:String first,int:99

D． int:99,Stfing:Int first

以下程序的运行结果为？

class xyz {

public static void main(String args[]) {

int i,j,k;

for (i = 0; i< 3; i++) {

for(j=1; j< 4; j++) {

for(k=2; k<5; k++) {

if((i == j) && (j==k))

System.out.println(i);

}

}

}

}

}

A. 0

B. 1

C. 2

D. 3

E. 4

【填空题】预测程序运行结果 class Student{ private int age; public void setAge(int a){ age=a;} public int getAge(){ return age; } } public class StudentDemo{ public static void main(String []args){ Student s=new Student(); s.setAge(20); System.out.println(s.getAge());}}

执行下列程序段之后，输出的结果为______。

public class exl0

{

public static void main(String[] args)

{

int i=3;

int j=7;

int k=8;

boolean b=j＞i∧k!=i;

System.out.println(b);

}

}

写出以下程序的运行结果？ public class Test{ public static void main(String argv[]){ String s = new String("hello"); myMethod(s); System.out.println("s=" + x); } public static void myMethod(String s){ s = s + "!"; } }

A、s=hello!

B、s=hello

C、hello!

D、hello