【多选题】【消耗次数：1】
以下说法正确的是( )
①
打开一个表，该工作区中原先打开的表自动关闭
②
一个工作区，只能打开一个表
③
一个工作区，可以同时打开多个表
④
表操作结束后应及时关闭，以便将内存的数据保存到表中
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