在多角化策略中,有中心式及()式的差别。
参考答案:复合
Metal making machines and many other things. [ ]
A. used to
B. is used for
C. is used as
D. is used to
排除以下哪项可诊断胰腺假性囊肿()
A.发病后4~6周由胰腺周围积液形成
B.可合并有囊壁钙化
C.内壁为上皮组织
D.可合并感染