订立委托合同应以委托方和被委托方具有的( )为基础。
A．代理关系 B．相互信任 C．诚心关系 D．合作关系
参考答案：B
作为路基填料土地，其液限和塑性指数应分别不大于______。
A．50，26 B．50，30 C．60，26 D．55，30
The mother of a 2-year-old child tells the nurse that her baby is using a potty seat but is still having problems toilet-training. Which of the following suggestions by the nurse would he most appropriate
A．Offer the child more praise each time.
B．Use a potty chair instead of a potty seat.
C．Focus on the "accidents" that occur during training.
D．Defer training until the child is developmentally ready.
