圆柱两个底面之间的距离叫做（    ）。

下列代码实现从文件file.dat中读出第5个字节到变量c中，横线处应该填入下列项中的______。 import java.io.*; public class exl5 { public static void main(String[] args) {try System.out.println((char)c);catch(Exception e){ e.printStackTrace();} } }

A．FileInputStream in = new FileInputStream("chl/fildat");iskip(4);int c = iread();

B．FileInputStream in = new FileInputStream("chl/fildat");iskip(5);int c = iread();

C．Fi2eInputStream in = new FileInputStream("fildat");int c = iread();

D．RandomAccessFile in = new RandomAccessFile ("chi/fil dat ");iskip (4);int c = ireadByte();