Professionals involving in such development should have a unique sense of innovation, the ability to assimilate new information, outstanding development skills and a striving sense of international cooperation.

A．involved to

B．involved as

C．involving as

D．involved in

变电站直流系统状态评价时，可分为以下哪几个部分？（）

A.蓄电池

B.充电装置

C.馈电及网络

D.监测单元