A.有對(duì)稱軸 B.有對(duì)稱面 C.對(duì)稱軸與對(duì)稱面垂直 D.有旋轉(zhuǎn)反伸軸
A.必有n個(gè)L2垂直Ln B.任意相鄰的L2交角為360°/(2n) C.對(duì)稱要素組合簡(jiǎn)式為L(zhǎng)n×L2→LnnL2 D.Ln與L2交點(diǎn)為對(duì)稱中心
A.Li2=C B.Li3=L3+C C.Li6=L3+P D.Li1=C