如图,Rt△ABC中,∠ACB=90°,以AC为直径的⊙O交AB于点D,过点D作⊙O的切线,与边BC交于点E,若AD=95,AC=3.则DE长为( )
It's difficult to live in a foreign country, ______ if you can't understand the language there.
如图,在直径AB=12的⊙O中,弦CD⊥AB于M,且M是半径OB的中点,则弦CD的长是( )