A:通过减数分裂不断增殖
B:都有染色单体
C:都在合成蛋白质
D:DNA量都相等
如图,点A是半圆上一个三等分点,点B是的中点,点P是直径MN上一动点,若⊙O的半径为1,则AP+BP的最小值是____ .
Go downstairs, stand in line on the playground as soon as possible.
l1:2x+y﹣1=0,l2:y=kx﹣5,l1⊥l2的充要条件( )