中枢神经系统包括
A、脊神经CD
周围神经系统通常由三部分组成，包括脊神经、脑神经和植物性神经。中枢神经系统包括脊髓与脑。本题选CD。
________ the concert had begun did we realize what a splendid show it was going to be.
We must ______ that the experiment is controlled as rigidly as possible.
党在“过渡时期总路线” 中提到的“过渡”是指从 ___________。
A great number of small power stations ________ (set up) in their county since liberation.
设f(x, y)在点(0,0)附近有定义,且
,则
