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【简答题】
若方程 x 2 4-k + y 2 6+k =1 表示焦点在x轴上的椭圆，则k的取值范围是______．
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举一反三
【单选题】The best proof against man's intelligence is that ______.
A.
he is greedy and he has a violent hunger for wealth
B.
he is cruel and is not above robbing his fellowmen of their possessions
C.
he assumes that he is superior to other animals in spite of his past record
D.
he is an unreasoning creature
【简答题】请简述使用PHP进行MySQL数据库编程的基本步骤。 请简述使用PHP进行MySQL数据库编程的基本步骤。