—What's your idea about family education?
— kids learn to be independent, it is for their future.
A：The earlier, the better
B：The more, the more
C：The earlier, the earlier
D：The better, the earlier
将细胞膜破坏后，形成匀浆，将匀浆放入离心管中，用髙速离心机进行差速离心，分离细胞核与线粒体的正确方法应是（ ）
实数﹣ 2 的绝对值是（ ）
