A:NaHCO3的水解:HCO3-+H2O ⇌ H3O++CO32-
B:醋酸铵的电离:CH3COONH4 ⇌ CH3COO-+ NH4+
C:汽车尾气净化反应:2NO+2CO=2CO2+N2能够自发进行,则该反应的△H>0
D:碳在高温下还原二氧化硅:SiO2+2C 高温__ Si+2CO↑
“厉行勤俭节约,反对铺张浪费”势在必行,最新统计数据显示,中国每年浪费食物总量折合粮食大约是210000000人一年的口粮.将210000000用科学记数法表示为( )
I'm 1English boy. My name 2 Tom. I'm a student. My teacher3 Miss Green. I have a sister.4 name is Lily. We are 5 the same school.
We have two good 6named Jenny and Danny. They7 from Canada. They 8in China now. They9 blond hair and blue eyes. They10 China. We are all happy.
下列动物不属于现代类人猿的是( )
____×____=____(元)
长江中下游地区最突出的自然灾害是( )