当线路传递功率一定时,线路损耗与功率因数的关系是()。
A、成正比
B、成反比
C、无关
D、与用户用电要求有关
参考答案:B
She is very dear to us. We have been prepared to do _________ it takes to save her life.
A.whichever
B.however
C.whatever
D.whoever
将消费者需求区分为天然需求和社会需求,这是按消费者需求的( )分类。
A.性质
B.起源
C.层次
D.对象