系统性与循序渐进相统一的原则，是指教学按照学科的逻辑系统和学生的认识发展顺序进行，使学生系统掌握（）和（），形成严密的逻辑思维能力。
化合物结构对物质降解与转化作用的影响。
每节车厢应配备（）个定检合格的灭火器。 ["四","三","五"]
What are three advantages of VLANs?（） [" VLANs establish broadcast domains in switched networks."," VLANs utilize packet filtering to enhance network security."," VLANs provide a method of conserving IP addresses in large networks."," VLANs provide a low-latency internet working alternative to routed networks."," VLANs allow access to network services based on department, not physical location."," VLANs can greatly simplify adding, moving, or changing hosts on the network."]
视象记忆
什么是质化研究，有哪些主要特点？
