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【单选题】
如果圆 x 2 + y 2 + Dx + Ey + F = 0( D 2 + E 2 - 4 F >0) 关于直线 y = x 对称,则有 ( )A.
D ＋ E ＝ 0
B.
D ＝ E
C.
D ＝ F
D.
E ＝ F
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【单选题】下面程序运行时,内层循环的循环总次数是( ) For m = 1 To 3 For n = 0 To m - 1 Next n Next m
A.
6
B.
3
C.
0
D.
9
【简答题】下面程序运行时,内层循环的循环总次数是 . For m = 1 To 3 For n = 0 To m - 1 Next n Next mA. 5 B. 7 C. 6 D. 4
【简答题】One afternoon, many years ago, I went to pick up my mother from work. I got there a little early so I 1 the car by the roadside and waited for her. As I looked 2 the car window, there was a small park...
【简答题】One afternoon, many years ago, I went to pick up my mother from work. I got there a little early so I 21 the car by the roadside and waited for her. As I looked 22 the car window, there was a small pa...
【简答题】简述分组交换方式的主要优缺点。
【单选题】. Clean water is ____ necessary than fresh air to the people living in big cities.
A.
no more
B.
no less
C.
much as
D.
not any more
【单选题】The days are gone________you can breathe fresh，unpolluted air or drink clean, unpolluted water in the countryside.
A.
when
B.
that
C.
where
D.
which
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