用于预防、治疗和诊断动物疾病，或有目的地调节动物生理机能、促进动物生长、繁殖和提高生产效能的物质是（）。
A. 抗生素
B. 兽药
C. 消毒剂
D. 杀虫剂
查看答案
What are three advantages of VLANs?（）
A. VLANs establish broadcast domains in switched networks.
B. VLANs utilize packet filtering to enhance network security.
C. VLANs provide a method of conserving IP addresses in large networks.
D. VLANs provide a low-latency internet working alternative to routed networks.
E. VLANs allow access to network services based on department, not physical location.
F. VLANs can greatly simplify adding, moving, or changing hosts on the network.
提示有脑膜炎存在的表现是头痛伴有（）
A. 发热
B. 精神症状
C. 眩晕
D. 癫痫样发作
E. Kernig征阳性
微信支付 
支付宝支付