NH3是一种重要的化工原料,可以制备一系列物质(如图所示).下列说法正确的是( )
A:NH4Cl和NaHCO3都是常用的化肥
B:NH4Cl、HNO3和Na2CO3受热时都易分解
C:NH3和NO2在一定条件下可发生氧化还原反应
D:图中所涉及的盐类物质均可以发生水解反应
To keep children away from danger,we warn parents ________ children at home alone.
Students in our school are encouraged to ________more activities after class in order to broaden their knowledge. ( )
下图甲、乙、丙是三种等量食物进入消化道后,该食物残留量与时间的关系。据图分析甲、乙、丙三者依次为( )