1的倒数是______.
1的倒数是1.
故答案为:1.
下列各组物质中化学键的类型相同的是( )
A.HCINH4Cl
B.Na2OA1C13
C.NaOHH2O
D.NH3CO2
When things aren't going well, my parents always () (鼓励)me, telling me not to give up.