A.互相吸引 B.相互排斥 C.沒反應(yīng) D.有時(shí)吸引.有時(shí)排斥
A.引流線擺動(dòng) B.電擊 C.設(shè)備損壞 D.短路
A.1% B.5% C.10% D.20%