测量电池单体电压时数据必须精确到（） ["小数点后二位","小数点后四位","小数点后一位","小数点后三位"]
因火灾一个易熔塞溶化时，会发生哪种情况（） ["只关闭全部井的井口安全阀（SSV）","关闭部分井的井口安全阀（SSV）和井底安全阀（SSSV）","只关闭部分井底安全阀"]
招标人和中标人不应当自中标通知书发出之日起三十日内，按照招标文件和中标人的投标文件订立书面合同。
In which scenario will you use the Flashback Transaction Query feature？（） [" when you want to restore an important table that is dropped from the Recycle Bin"," when you want to obtain the SQL statements to undo the deletion of some important records from a table by a transaction","when you want to restore a dropped user’s schema"," when a row of a table is updated many times within a specific time period and you want all the versions of the row in the specified time period"]
新建锅炉投入运行的必备条件包括（）、（）、（）。
简述如何有效利用幼儿园经费。
