A.屏蔽電纜 B.聚氯乙烯絕緣電纜 C.普通電纜 D.絕緣電纜
A.大于0.5 B.0.5 C.不大于0.4 D.小于0.5
A.移頻和UM71 B.移頻和交流計數(shù) C.交流計數(shù)和UM71 D.極頻和UM71