设计计算时，地震作用的大小与下列（）因素有关。

①建筑物的质量

②场地烈度

③建筑物本身的动力特性

④地震的持续时间

A.①③④

B.①②④

C.①②③

D.①②③④

General communications are those communications（）.

A.between ship stations and shore-based communication networks

B.concern the management and operation of ships

C.may have an impact of the safety on ships

D.all of A, B, C