A:we can; by
B:can we; for
C:we can; round
D:can we, against
已知双曲线x2cos2θ-y2sin2θ=1(π2<θ<π)的右焦点为F,P是右支上任意一点,以P为圆心,PF长为半径的圆在右准线上截得的弦长恰好等于PF,则θ的值为( )
除去下列物质中混有的少量杂质(括号内为杂质),所用方法正确的是( )
—He's in the kitchen.