二次函数 y=2(x-3)²+2 的二次项系数、一次项系数、常数项分别为（　　）

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在直角坐标系中,直线$\sqrt{3}x-y-3=0$的倾斜角是（　　）

一些科学家测算，由于现代工业的发展，大量燃烧煤、石油、天然气向大气中排放二氧化碳日益增多．二氧化碳能大量吸收地面放出的热量，进而使全球气温有明显变暖的趋势．为了防止这种现象，适宜的方法有（　　）

①立即停止使用煤、石油、天然气等燃料        ②积极开发使用新能源

③植树造林，保护好现有的原始森林              ④扩大海洋面积，调节气温．