说明句中的词类活用现象
晋灵公不君。
干粉输送管道的安装要求正确的是（）。 ["防腐处理的无缝钢管不采用焊接连接","采用螺纹连接时，管材采用机械切割","采用法兰连接时，衬垫不能凸人管内，其外边缘宜接近螺栓孔，不能放双垫或偏垫","安装后的螺纹根部有2～3扣外露螺纹，连接处外部清理干净并做防锈处理","管道末端采用防晃支架固定，支架与末端喷头间的距离不大于500mm"]
Which two of these correctly describe asymmetric routing and firewalls?（） [" only operational in routed mode"," only operational in transparent mode"," only eight interfaces can belong to an asymmetric routing group"," operational in both failover and non-failover configurations"," only operational when the firewall has been configured for failover"]
从功能看，“信、远、看、讲”是（）语素；从位置上看，“了、的、吗”是定位语素。
描述记录的方法包括（） ["日记记录法","一事记录法","连续记录法","以上都是"]
什么叫备用电源自动投入装置？
