施工现场灭火及应急疏散预案应包括的内容有（）。

A.应急灭火处置机构及各级人员应急处置职责

B.施工现场重大火灾危险源辨识

C.报警、接警处置的程序和通信联络的方式

D.扑救初起火灾的程序和措施

E.明确设置应急照明的场所、应急照明灯具的类型、数量、安装位置等

The medicine has many functions,______are unknown to us.

A．some of which

B．that some of them

C．of which some of them

D．which of them