下列费用中，（）属于建筑安裝工程间接费。 企业管理费。 工程监理费。 建设单位管理费。 住房公积金。 勘查设计费。
安装工程保险中责任赔偿部分的保险标的为（）。 A.第三者责任 。 B.土木建筑工程项目 。 C.安装施工用机械设备 。 D.场地清理费。
Refer to the exhibit. Which Virtual Router Redundancy Protocol （VRRP） statement is true about the roles of the master virtual router and the backup virtual router？（） Router A is the master virtual router， and Router B is the backup virtual router. When Router A fails， Router B will become the master virtual router. When Router A recovers， Router B will maintain the role of master virtual router.。 Router B is the master virtual router， and Router A is the backup virtual router. When Router B fails， Router A will become the master virtual router. When Router B recovers， it will regain the master virtual router role.。 Router A is the master virtual router， and Router B is the backup virtual router. When Router A fails， Router B will become the master virtual router. When Router A recovers， it will regain the master virtual router role.。 Router B is the master virtual router， and Router A is the backup virtual router. When Router B fails， Router A will become the master virtual router. When Router B recovers， Router A will maintain the role of master virtual router.。
“全或无”特性
色性
根据《蒸汽锅炉安全技术监察规程》的规定：对于额定蒸汽压力小于等于3.8MPa的锅炉，安全阀的流道直径不应小于（）。
