以下哪项是肝细胞肝癌的特异性表现()。
A. 类圆形的实性团块
B. 局部轮廓隆起
C. 外周绕有声晕,内有“块块”或“镶嵌征”
D. 绕有强回声边缘的结节
E. 外周血管受压
In relation to MPLS Multicast VPN, which three statements about multicast distribution (MDT) groups aretrue? ()
A. Default MDT groups are used for PIM control traffic, low-bandwidth sources, and flooding of sparse mode traffic.
B. MDTs are built in customer networks
C. Data MDT groups are used for high-bandwidth sources to reduce replication to uninterested PEs.
D. MDTs are built in provider networks
E. The number of MDTs depends on PIM modes of MDT groups.
我国的强制性国家标准的代号为();推荐性国家标准的代号为();轻工行业标准的代号为();企业标准的代号为()。
一名3岁男童在幼儿园进食后,出现严重腹痛和便血。同时进食儿童也有数人出现相同的症状。在治疗中病情加重,又出现肾衰竭,临床诊断为出血性结肠炎。最可能的病原菌是()
A. 霍乱弧菌0139
B. EHEC
C. EPEC
D. EIEC
ETEC