题目内容

下列说法错误的是()

A. java的标准输入对象为System.in
B. 打开一个文件时不可能产生IOException
C. 使用File对象可以判断一个文件是否存在
D. 使用File对象可以判断一个目录是否存在

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二端口网络可按不同方式进行连接,主要有( )。

A. 级联
B. 串联
C. 并联

Conversation 2

Conversation 1[音频]W: Why do you look so unhappy?M: It's the mid-term test. I got a C and Mom was angry.W: Then?M: Then I said it was not my fault. I was busy with my part-time job.W: 1) __________________________________.M: Why do you say I'm wrong?W: You got a C because you didn't work hard, not because of the part-time job.M: Well, I guess 2)________________ .W: So you get 3) __________?M: Yes, and I'll say sorry to Mom.

java.io包的File类是()

A. 字符流类
B. 字节流类
C. 对象流类
D. 不属于上面三者

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