In order to put an end to poverty, the World Bank has switched its ______to providing technical assistance and long-term loans to developing countries.

A．concern

B．process

C．struggle

D．focus

当N2大于15%，FADEC系统的供电是（）

A、由飞机电源提供

B、由地面电源提供

C、由FADEC自身的磁交流发电机提供