励磁自动调节应保证发电机端电压静差率小于（）倍。 ["0.5%","1%","1.5%","2%"]
USB1.1总线标准属于中低速的界面传输，数据传输率（）Mbps ["12","133","166","480"]
测定亚硫酸钠过剩量用（）作指示剂。 ["（A）酚酞","（B）甲基橙","（C）铬酸钾","（D）淀粉"]
什么叫内以能？
USB2.0接口的数据传输率最高可达（）Mbps ["400Mbps","480Mbps","500Mbps","560Mbps"]
液压支架日常维修的主要内容有哪些？
