监管物中材质单涉及到的元素符号，需要我们识别：铁（）铜（）锰（）铝（）铬Cr。
寻找新闻由头有的方法有（）。 ["由近及远法","循序渐进","现场观察法","避旧出新法"]
The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to（） ["precipitate silica from solution","reduce corrosion in the heating coil","prevent clogging and erosion in the coil","maintain zero water hardne"]
在做KDS之前，必须要检查（） ["轮胎压力","轮距","轴距","悬挂高度"]
变电站直流母线失压有何影响？应如何处理？
简述分批整经技术措施。
