【单选题】执行语句序列 ofstream outfile(”DATA.DAT'); if(…)cout<<'OK';elsec out<<'FAIL'; 后,如果文件打开成功显示“OK”,否则就显示“FAIL”。由此可知,上面if语句的…处的表达式应是 A.outfile.fail()或 outfile
B.
outfile.good()或 !outfile
C.
outfile.good()或 outfile
D.
outfile.fail()或 !outfile
【单选题】Before he spoke to the crowd, Jackson took a deep breath to ____ his excessive nervousness.
【判断题】在线性规划问题的最优解中,如果一变量 x j 为非基变量,则在原来问题中,无论改变它在目标函数中的系数 c j 或在各约束中的相应系数 a ij ,反映到最终单纯形表中,除该列数字有变化外,将不会引起其他列数字的变化。
【简答题】运行下列程序时,若没有test.dat文件,则______。import java.io.*;public class Test{ public static void main(String[] args){ try{ RandomAccessFile raf=new RandomAccessFile("test.dat","r"); Syste...
【简答题】His excessive drinking has _______ affected his
health and how he functions socially.A. adversely B. harmlessly C. reasonably D. thoughtfully
【单选题】The big man's rudeness was due to ______
【单选题】The big man's rudeness was clue to ______.