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已知曲线C:y=2x2,点A(0,-2)及点B(3,a),从点A观察点B,要使视...
已知曲线C:y=2x2,点A(0,-2)及点B(3,a),从点A观察点B,要使视线不被曲线C挡住,则实数a的取值范围是( )
A.(4,+∞)
B.(-∞,4)
C.(10,+∞)
D.(-∞,10)
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