为了解决主存的容量满足不了要求，采用的技术是（）
B
暂无解析
题目：Describinggraphs
_____thishashappenedonoccasion,thisistheexceptionanddefinitelynottherule.
Inasecond-handbookshop,Billycameacrossabookwhichhethoughtwascertainlya____edition.
Hehasfourson,____(他们全部都是那个偏僻山村里的高级教师)。
Hedidn'tknowwhichroom____.
