固定资产卡片需要每年更换一次。

单项选择题In international trade, when issues occur resulting from misunderstanding or accidents, the party that suffers losses will surely make a(n) _____, asking for compensation. A. enquiry B. offer C. complaint D. claim

单项选择题由于沉淀池的沉淀污泥容易发生腐败，因此必须在沉淀池底部设置( )，迅速排出沉淀污泥。