A:神府煤矿
B:白云鄂博稀土矿
C:平朔煤矿
D:金昌镍矿
已知椭圆的参数方程为x=cosφy=2sinφ(φ为参数),点M在椭圆上,点O为原点,则当Φ=π3时,OM的斜率为( )
Jeff has a lot of ____ (meat) for lunch every day.