A:what
B:that
C:which
D:whose
____个
甲状腺属于内分泌腺. .(判断对错)
I'm not______ you. I admire what you did.
如图,在△ABC中,∠ACB=90°,AC=BC,P为三角形内部一点,且PC=3,PA=5,PB=7,则△PAB的面积为____
已知(2x+3)4=a0+a1x+a2x2+a3x3+a4x4,若a=(a0+a2+a4)2﹣(a1+a3)2,则∫024-x2dx=____