水表检定装置配套使用的玻璃转子流量计是一种专用（） ["容器","量器","衡器","流量计"]
某企业房屋类固定资产原值为300000元，预计净残值率为10%，平均使用年限为20年。计算月折旧率、月折旧额。
我国消防安全管理的发展不包括（）阶段。 ["古代消防安全管理","近代消防安全管理","现代消防安全管理","原始消防安全管理"]
Lafeyette Productions is looking for a new ISP that has improved availability， load balancing， andcatastrophe protection. Which type of ISP connectivity solution would be best？（） [" single run"," multi-homed"," stub domain EBGP"," direct BGP peering"]
经济外部性
叠锥
