Which of the following is not an AVL tree?A．B．C．D．
Which of the following is not an AVL tree?
A．
B．
C．
D．
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You’re going to have a quiz ( )by another two in the ( )month. A. followed,followedB. followed,followingC. following,followedD. following,following
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现有：classTree{privatestaticStringtree=tree；StringgetTree（）{returntree；}}classElmextendsTree{privatestaticStringtree=elm；publicstaticvoidmain（String[]args）{newElm（）.go（newTree（））；}}voidgo（Treet）{Strings=t.getTree（）+Elm.tree+tree+（newElm（）.getTree（））；System.out.println（s）；}结果为：（）
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1、tree.add（6); tree.add（1); tree.add（1); 则遍历树集tree之后，可以输出1,1,6。（）