【简答题】△△□★★☆△△□★★☆…第40个是______.
【简答题】测汞水样的消解方法有_______、_______、_______。
【判断题】Items such as sales tickets, bank statements, checks, and purchase orders are source documents.
【判断题】Items such as sales tickets, bank statements, checks, and purchase orders are source documents.