判断题
The agencies like AP AFP and Xinhua were the pioneers in developing foreign correspondence in the 19th and 20th centuries.
The agencies like AP AFP and Xinhua were the pioneers in developing foreign correspondence in the 19th and 20th centuries.
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单项选择题
要从“file.dat”文件中读出第10个字节到变量c中，下列哪个方法适合? （ ）
要从“file.dat”文件中读出第10个字节到变量c中，下列哪个方法适合? （ ）
A．FileInputStream in=new FileInputStream("file.dat");
int c=in.read();
B．RandomAccessFile in=new RandomAccessFile("file.dat");
in.skip(9);
int c=in.readByte();
C．FileInputStream in=new FileInputStream("file.dat");
in.skip(9);
int c=in.read();
D．FileInputStream in=new FileInputStream("file.dat");
in.skip(10);
int c=in.read();
轴的正方向运动，代表此简谐振动的旋转矢量图为( ) A. 
B. 
C. 
D. 