A.0.1 B.0.2 C.0.3 D.0.4
A.11h B.15h C.7h D.10h
A.上盤往上移,下盤向下移 B.上下盤相對(duì)平移 C.兩盤沒(méi)有位移 D.上盤向下移,下盤向上移