【简答题】选择适当的词语并用其正确形式填空。 belong to apart from lack of meet with as cool as a cucumber hold up make no difference expect refer to adjust to 1. ______ his earnings as a ...
【简答题】在斜坐标系xOy中,∠xOy, . e 1 , . e 2 分别是Jc轴,轴方向的单位向量.对于坐标平面内的点P,如果 . OP =x . e 1 +y . e 2 ,则Ge,叫做P的斜坐标. (1)已知P的斜坐标为( 2 ,1)则 | . OP | =______. (2)在此坐标平面內,以O为原点,半径为1的_的方程是______.