失能收入损失保险保障的内容之一是（）

A、被保险人因自杀而致残疾的收入损失

B、被保险人因吸毒而致残疾的收入损失

C、被保险人因意外伤害而致残疾的收入损失

D、被保险人因战争而致残疾的收入损失

Sub-contractors should obey the contractor in information system project. When censoring sub-contractors, the supervisor mostly concerns about ______.

A．Amount of subcontract

B．qualifications and abilities of sub-contractors

C．responsibilities and obligations of sub-contractors

D．the contents of the subcontract