【简答题】以平面直角坐标系的原点O为极点,x轴的正半轴为极轴,且在两种坐标系中取相同的长度单位.直线l极坐标方程为 ρsin(θ+ π 4 )=2 2 ,圆C的参数方程为 x=3cost+5 y=3sint+5 (其中t为参数) . (1)将直线l极坐标方程化成直角坐标方程; (2)试判断直线l与圆C的位置关系.
【简答题】Choosing the right dictionary depends on __________ you want to use it for. A.what B.why C.how D.whether
【单选题】Choosing the right dictionary depends on ________ you want to use it for.
【单选题】关于工程咨询系统分析的说法,错误的是( )。
【简答题】(选做题)在平面直角坐标系中,以坐标原点O为极点,x轴的正半轴为极轴建立极坐标系.已知直线l上两点M,N的极坐标分别为(2,0),( ),圆C的参数方程 (θ为参数)。 (1)设P为线段MN的中点,求直线OP的平面直角坐标方程; (2)判断直线l与圆C的位置关系
【单选题】Which of the following is NOT the factor in choosing the right medium?
A.
Whether the budget can be afforded.
B.
Which target audience the products are intended for.
C.
Which medium can best display the products.
D.
How to advertise the products with the right technique.