A:120页
B:128页
C:188页
D:172页
给下面的句子选择合适的答语。
①Happy birthday! ____ A. Two books.
②How old are you? ____ B. Thank you.
③How many books? ____ C. You're welcome.
④Let's eat the cake. ____ D. I'm 10.
⑤Thank you. ____ E. Great.
如图,点C是半圆O的半径OB上的动点,作PC⊥AB于C.点D是半圆上位于PC左侧的点,连结BD交线段PC于E,且PD=PE.(1) 求证:PD是⊙O的切线.(2) 若⊙O的半径为43,PC=83,设OC=x,PD2=y.①求关于的函数关系式.②当x=3时,求tanB的值.
根据下图,判断下列说法正确的是( )
选词填空。选出适当的短语,完成对话。
bus driver big family very thirsty green T-shirt Welcome to
下列关于血细胞的叙述,错误的是( )