【单选题】【消耗次数：1】
C#中使用SerialPort类时需引入那个命名空间？
①
System.IO.Ports
②
System.IO
③
System.Ports
④
System
参考答案：
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相关题目
【简答题】
要在一个类中包含System.Data命名空间的语句是[填空1]。
【单选题】
以下程序的运行结果是：（ ）
public class Increment{
public static void main(String args[]){
int c;
c = 2;
System.out.println(@@;
System.out.println(c++);
System.out.println(@@;
}
}
①
2 2 2
②
2 3 3
③
2 2 3
④
3 4 4
【单选题】
getCustomerInfo()方法如下，try中可以捕获三种类型的异常，如果在该方法运行中产生了一个IOException，将会输出什么结果（ ）
public void getCustomerInfo() {
try { // do something that may cause an Exception
} catch (java.io.FileNotFoundException ex){
System.out.print(FileNotFoundException!);
} catch (java.io.IOException ex){
System.out.print(IOException!);
} catch (java.lang.Exception ex){
System.out.print(Exception!);
}
}
①
IOException!
②
IOException!Exception!
③
FileNotFoundException!IOException!
④
FileNotFoundException!IOException!Exception!
【单选题】
The thieves _____ the possibility of the alarm system sounding
①
overtook
②
overcame
③
overlooked
④
overworked
【判断题】
4．Java系统的标准输入对象是System.in，标准输出对象有两个，分别是标准输出System.out和标准错误输出System.err。（ ）
①
正确
②
错误
【单选题】
Java系统标准输出对象System.out使用的输出流是（ ）。
①
PrintStream
②
PrintWriter
③
DataOutputStream
④
FileReader
【单选题】
_____the center of our planetary system was considered as heresy by the church in the Middle Ages.
①
It is the sun and not the earth
②
That the sun and not the earth is
③
Being the sun and not the earth
④
The sun and not the earth
【单选题】
By using a system approach to health care, early ( )practitioners discovered acupuncture points.
①
Western
②
Southern
③
Northern
④
oriental
【单选题】
阅读以下代码：
import java.io.*;
import java.util.*;
public class foo{
public static void main (String[] args){
String s;
System.out.println(s= + s);
}
}
输出结果应该是：（ ）
①
代码得到编译，并输出“s=”
②
代码得到编译，并输出“s=null”
③
由于String s没有初始化，代码不能编译通过
④
代码得到编译，但捕获到 NullPointException异常
随机题目
【单选题】
A: Thanks to John, weve lost our most important client. B: Ive told you hes not proper for the position. A: [填空].
①
I should have listened to you
②
I dont really agree with you
③
It doesnt matter. I trust him
④
Thank you for being so helpful
【单选题】
A: How long does it take to get to your house by bus? B: [填空]. I think the tube is your best choice. A: Many thanks.
①
I dont know yet
②
It depends on the traffic
③
Let me see
④
Youll consider the distance
【单选题】
A: Hi. My name is David Manning. Im from Britain. B: Im Bill Clinton. Glad to meet you. What year are you? A: [填空].
①
Im a first-year student
②
I was born in 1990
③
Ive been here for years
④
Im 19 years old