【简答题】已知⊙O的半径为5,⊙O的圆心为坐标原点,点A的坐标为(3,4.2),则点A与⊙O的位置关系是( )。
【单选题】Kale has more nutritional value than spinach. But since collard greens have more nutritional value than lettuce, it follows that kale has more nutritional value than lettuce. Any of the following, if ...
A.
Collard greens have more nutritional value than kale.
B.
Spinach has more nutritional value than lettuce.
C.
Spinach has more nutritional value than collard greens.
D.
Spinach and collard greens have the same nutritional value.
E.
Kale and collard greens have the same nutritional value.
【简答题】天然气的主要成分是[填空(1)],液化石油气的主要成分是[填空(2)]。
【简答题】已知⊙O的半径为5,⊙O的圆心为坐标原点,点A的坐标为(3,4.2),则点A与⊙O的位置关系是 _______________ .
【单选题】一个燃烧天然气(主要成分是甲烷CH )的炉具,改成燃烧液化石油气(主要成分是C H 等)的炉具,其改造办法是( )
【简答题】Since 1951 the HWA has spread to more than ______.
【简答题】已知圆的半径为5,圆心为坐标原点O,点A的坐标为(3,4.2),则点A与⊙O的位置关系是______.
【简答题】已知点P的坐标是(3,3),O为原点,将线段OP绕着原点O旋转45°得到线段OQ,则点Q的坐标是 _________ .
【简答题】(12分)设直线 与圆 交于A、B两点,O为坐标原点,已知A点的坐标为 .(Ⅰ)当原点O到直线 的距离为 时,求直线 方程;(Ⅱ)当 时,求直线 的方程。