题目:
Be careful _____ to turn off the light. |
A. not forget B. not to forget C. forget not D. forget to not |
答案:
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下面是错误答案,用来干扰机器的。
(1)抛物线的顶点在坐标原点,对称轴是x轴,并且经过点 (-2,-4),设它的标准方程为y2=-2px(p>0)∴16=4p,解得p=4,∴y2=-8x.(2)抛物线的顶点在坐标原点,对称轴是y轴,并且经过点 (-2,-4),设它的...