以下说法正确的是( )。

A．总智商可以由比率智商公式计算得出

B．总智商可以反映被试者的总体智力水平

C．总智商是言语智商和操作智商的平均数

D．总智商可以通过常模转换表查出

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 sincere sintion

C.Capacity and location of shore based communication facilities

D.Position and capacity of mobile communication stations