由于阴影效应引起的衰落称为()。
A、多径衰落
B、瑞利衰落
C、对数正态衰落
D、路径损耗
参考答案:C
平常我们说月亮躲进云里,是以________为参照物。说乌云遮住了月亮,则是以________为参照物.
the lack of water and food, the homeless have to deal with the cold weather.
A.As well
B.In spite of
C.Apart from
D.In danger of