He wouldn’t listen to others’ advice. Obviously, it was his own attitude that _____ his loss.

A．argued for

B．accounted for

C．searched for

D．intended for

ib等级的本安型仪表在正常工作状态下，以及电路中存在（）时不能点燃爆炸性气体混合物。

A、一个或两个故障

B、一个故障

C、两个故障

D、两个或三个故障