初级卫生保健又称（）

A.基层卫生保健

B.低级卫生保健

C.农村卫生保健

D.一级卫生保健

E.综合卫生保健

The GMDSS defines four sea area based on the（）.

A.location and capacity of the facilities located on board ships

B.Position and type of a sincre sintion

C.Capacity and location of shore based communication facilities

D.Position and capacity of mobile communication stations