A:Fe+2HCl═FeCl2+H2↑
B:2NO+O2=2NO2
C:3CO+Fe2O3 高温__ 2Fe+3CO2
D:2NaCl 电解__ 2Na+Cl2↑
斯塔夫里阿诺斯在《全球通史》中这样论述某历史事件:“(这场运动)关心的是今世而不是来世;它关注的是非宗教的古典文化而不是基督教神学。”这场运动( )
2015年8月,新修订的《中小学生守则》正式印发,“上课专心听讲,积极发表见解”“虚心接受批评,学会合作共处”等更具操作性的具体行为规范被写进守则.以下同学的做法符合中学生守则的是( )
观察、调查、收集和分析资料都是科学探究的方法.
①“x2+x﹣2>0”是“x>1”的充分不必要条件
②命题:“∀x∈R,sinx≤1”的否定是“∃x0∈R,sinx0>1”.
③“若x= π4 ,则tanx=1,”的逆命题为真命题;
④若f(x)是R上的奇函数,则f(log32)+f(log23)=0.
阅读理解
Hello! My name is John, I have a happy family. There are four people in my family. They're my father, my mother, my baby sister and I. We have a beautiful garden. There are two trees and some flowers in it. There are some apples on the tree. Do you like apples and flowers? Welcome to my home.