A．Two detectives investigating the case had tested positive for traces of radiation.

B．The ex-wife and the former mother-in-law of the spy were also poisoned.

C．The Russian businessman who met the former spy in London has fallen ill.

D．There is a high degree of probability that it is polonium that killed the spy.

模块的耦合度描述了___( )___。

A．模块内各种元素结合的程度

B．模块内多个功能之间的接口

C．模块之间公共数据的数量

D．模块之间相互关联的程度