主动脉根部手术不包括（）

A.David术

B.ElephantTrunk术

C.Bentall术

D.Wheat’s术

E.Cabrol术

While managing the separation anxiety during hospitalization for a two-year-old boy, which of the following suggestions would be most helpful to the parents

A．Tell the child the time they are leaving and returning.

B．Bring the child's favorite toys from home.

C．Leave while the child is sleeping.

D．Keep the visit time short.