A:①②
B:②③
C:①③
D:③④
在Rt△ABC中,∠ACB=90°,O在AB上,⊙经过点A,与CB切于D,分别交AB、AC于E、F.
(1)求证:sin∠B=CDBD;
(2)连CE,AD相交于P,sinB=25,求CPEP.
下列关于声音的传播的说法中,正确的是
A. OK.
B. No, it isn't.
C. It's an eggplant.
D. No, I don't.
Mr. Liu is a really nice person --- the ________ person I know.