胎儿肠道是无菌的，生后数小时细菌侵入肠道，主要分布在____和____。
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正常肝脏CT值高于脾脏，所以肝脏肿瘤密度也比脾脏肿瘤密度高。（）
A. 正确
B. 错误
Which two statements are true about voice ports on a router？ （）
A. Calls to the PSTN can be made via the use of FXO or T1/E1 trunk ports.
B. Calls to the PSTN can be made via FXS or T1/E1 trunk ports.
C. Analog and IP phones can be connected to the VoIP network via FXO or T1/E1 trunk ports.
D. Calls between analog phones that are attached to the FXS ports in a VoIP network can be completely processed by voice-enabled routers.
钻杆直径直接影响回转器和升降机的（）。
A. 尺寸
B. 能力
C. 能力和尺寸
D. 质量
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