(74) is a network layer device that supports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains.

A. Repeater
B. Router
C. Bridge



D. Switch

危险化学品的范围按照国家公布的《危险化学品目录》进行确定。录井队常用的危险化学品有盐酸、四氯化碳等。