main device 主机 mainframe 主机，大型机｛计｝
网络与数据通信 协议体系与组成结构 释文 end system 端系统 网络与数据通信 协议体系与组成结构 释文 host 主机
- occupational health management in construction project
- occupational health monitoring on plateau railway
- occupational health of female worker
- occupational health prevention technology
- occupational health psychology
- occupational health risk assessment
- occupational health service
- occupational health supervision
- occupational health supervision and management
- occupational health surveillance
- occupational health technical service agency
- occupational health technology and protection
- occupational health “three at a time”
- occupational hepatic angiosarcoma
- occupational history
- occupational hygiene law
- occupational identity
- occupational infectious skin diseases
- occupational infertility
- occupational injury
- occupational injury prevention
- occupational laryngitis
- occupational lead poisoning
- occupational leukemia
- occupational lung cancer