对煤气实行分级管理，根据一氧化碳的含量，将作业区域分成（）类煤气危险区域。
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How could a large corporation with many specialized divisions benefit from using VLANs on their networks?（）
A. VLANs allow access to network services based on department, not physical location.
B. VLANs utilize packet filtering to enhance network security.
C. VLANs provide a low-latency, high bandwidth internetworking alternative.
D. VLANs provide a method of communication between IP addresses in large networks.
E. VLANs establish segmented broadcast domains in switched networks.
F. VLANs can greatly simplify adding, moving, or changing hosts on the network.
铁道上部建筑包括：（）、连接零件和安全设施等。
A. 道床
B. 接头
C. 轨枕
D. 钢轨
E. 道岔
塑料下肢矫形器的特点包括（）。
A. 重量轻、穿脱鞋方便、透气性好
B. 易调整、易修理
C. 可引起褥疮
D. 难以加工成正确形状
腹泻患儿须行粪便的常规检查和pH试纸检测。
A. 正确
B. 错误
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