铁芯绕阻上的交流电压与电流的关系是非线性的。
参考答案:错
— I didn't mean ______ my mother.
— But talking to her like that meant ______ her.
A.hurting; hurting
B.to hurt; hurting
C.hurting; to hurt
D.to hurt; to hurt
下列哪种方式不适用政府购买服务()。
A、竞争性谈判
B、协议供货
C、邀请招标
D、单一来源采购