Window2000中,能在当前窗口和其它非活动窗口之间进行切换的按键组合是()。
A.Alt+Tab
B.Alt+Esc
C.Ctrl+Tab
D.Tab+Esc
参考答案:A
He had to find a part-time job, for his family is too poor to _____ his educational expenses. [ ]
A. save
B. charge
C. lend
D. cover
将直线x+2y-2=0绕原点逆时针旋转90°所得直线方程是______.