重症水痘多发生在()或()病儿。
参考答案:恶性病;免疫功能受损
My postcard is still on the desk. Why ______ you ______ it
A. haven't ; postedB. didn't ; postC. wasn't ; postingD. won't ; post
采用邻接表存储的图的深度优先遍历算法类似于树的 (41) ,采用邻接表存储的图的广度优先遍历算法类似于树的 (42) 。
A.按层遍历
B.中根遍历
C.后根遍历
D.先根遍历