阿米巴脓肿的中央为坏死灶,呈 _________ 色,脓肿有薄壁。
参考答案：巧克力
The traffic policeman _____ the cars to run _____ at the crossing. [ ]
A. directed; to the right direction
B. showed; towards the right direction
C. showed; in the right direction
D. directed; in the right direction
在AutoCAD2009中激活块属性管理器的命令是（）。
A.BOOT
B.TMAN
C.BATTMAN
D.ATM
