下列物质与NaOH、Na2CO3、溴水、苯酚钠水溶液、银氨溶液和甲醇都能反应的是 [ ]
A.HCOOH
B.CH3CHO
C.CH3COOH
D.CH2=CH-COOH
答案:A
— I think you should phone Jenny and say sorry to her.
—________. It was her fault.
A.No way
B.Not possible
C.No chance
D.Not at all
圆的极坐标方程为ρ=2cosθ,则该圆圆心的极坐标为______.