A.1/2波長的整數(shù)倍 B.1/4波長的奇數(shù)倍 C.1/4波長的整數(shù)倍 D.以上都不對
A.0.5 B.-0.5 C.1 D.-1
A.0.937 B.-0.937 C.1.937 D.0.063