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在9、9、9、9、9、9、9这组数据中，众数是（     ）。

在9、9、9、9、9、9、9这组数据中，众数是（00a000a000a000a000a0）。

9*1=9 9*2=18 9*3=27 9*4=36 9*5=45 9*6=54 9*7=63 9*8=72 9*9=81

9……9×9……9＋199……9＝?

【单选题】我国深证证券交易所规定的开盘集合竞价时间为() A 、 9:15 ~ 9:25 B 、 9:25 ~ 9:30 C 、 9:00 ~ 9:30 D 、 9:30 ~ 11:30 A. 9:15 ～ 9:25 B. 9:25 ～ 9:30 C. 9:00 ～ 9:30 D. 9:30 ～ 11:30

上海证券交易所的集合竞价时间为 A: 9∶15—9：30 B: 9∶15—9：25 C: 9∶10—9：20 D: 9∶10—9：25

上海证券交易所开盘集合竞价阶段为（ ）。 A: 9：10～9：25 B: 9：15～9：25 C: 9：30～9：35 D: 9：15～9：30

二次曲线是无心曲线的充要条件是()。 A: a=b=9 B: a=9,b≠9 C: a≠9,b=9 D: a≠9,b≠9

从{1,2，… 9}中选取数字构成4位数.问有多少中方法 A: 9×9×9 ×9 =6561 B: 9×9×9 = 729 C: 9×8×7 ×6=3024 D: 9×8×7 =504