根据下列实验方案进行实验,能达到相应实验目的是( )
A:比较Zn和Fe的金属活动性强弱
B:探究铁钉生锈时O2是否参与反应
C:比较红磷和白磷的着火点
D:测定空气中O2的含量
We believe the public services in our city are good, and we are working hard to make it even .
Johndidn't go to work on Sunday afternoon. He ____ a horse.
My mother finds interesting to learn to drive a car.
我国在进行人口普查时,下列哪项工作不是调查时应该做的( )
如图为模拟膈肌运动的模型,请依图回答有关问题: