In relation to the legal system of Singapore, explain how the Application of English Law Act (Cap 7A) has clarified the extent to which English statutes and English case law apply in Singapore. (10 marks)

语音电话从3G切换到2G使用的是基于下行覆盖的切换。TD的两种基本业务类型将采取不同的切换参数执行切换，3A的测量控制参数有两种业务不同。（）

A、CS和HS业务

B、CS12.2k和CS64k业务

C、CS12.2k和短信业务

D、CS和PS业务