A level Ⅱ link group is
A、Alinkgroupwithtwolinksandthreemovingpairs;
B、Alinkgroupwithtwolinksandthreemovingpairs,andeachlinkhastwolowerpairsconnectedtootherlinks;
C、Alinkgroupofwhichlevel<=2;
D、Alinkgroupwithtwolinks
发布时间：2024-09-26 00:04:57
