You really play tennis well. I believe you will become a star in the future.
A:great trainer
B:famous player
C:good learner
父亲的X染色体只能传给女儿,Y染色体只能传给儿子.(判断对错)
如图,Rt△ABC中,AC⊥BC,CD⊥AB于D,AC=8,BC=6,求AD的长.