如图为空气成分示意图(按体积计算),其中“c”代表的是( )
A:氮气
B:氧气
C:二氧化碳
D:稀有气体
⑴Can I wear my jacket? ____ A.Yes, it is.
⑵Is it hot in Harbin? ____ B. It's windy today.
⑶What's the weather like today? ____ C. No, you can't.
①P在MN上;
②|PA﹣PB|最大.
①躯体运动中枢 ②躯体感觉中枢 ③视觉中枢 ④语言中枢