面部感染逆行常引起颅内哪种严重的并发症（）
A. 细菌性脑栓塞
B. 脑膜炎
C. 海绵窦血栓性静脉炎
D. 脑脓肿
E. 脑炎
Which two statements are true about Voice over IP （VoIP） packet delivery in a digital infrastructure？ （）
A. Packets can arrive out of order.
B. Packets must take the same path to the destination.
C. Once packets are received at the destination router， the router performs sampling to ensure the quality of the voice traffic.
D. Packets can experience varying delays across the network.
E. Packets containing voice samples are sequentially numbered by default， allowing for reordering upon arrival at the terminal router along the path.
关于用MTT比色法检测IL-2活性的表述，错误的是（）
A. 需要依赖细胞株
B. 活的增殖细胞具有吸收MTT能力
C. 颜色深浅反映细胞代谢活性的强弱
D. 可反映B细胞功能
E. 反映T细胞功能
HBV X区基因可编码的抗原是（）
A. HBsAg
B. HBcAg
C. HBeAg
D. HBxAg
E. HBV-DNA
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