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在PID调节系统中，对滞后大的对象宜加入（）.调节规律
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白棕绳穿绕滑车时，滑车的直径应大于绳直径的（）。
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You work in a company which is named Wiikigo Corp. The company uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance. There is a database named Dworks in the instance. The Dworks database has the Products table. Now you have to replicate the Products table to the SQL Server instances at remote locations, so you create a Merge Replication topology and a Publication to do this. The Publication has a 21-day retention period. There is a user who goes on a business trip, 30 days later he comes back and finds that data in his database is not the latest. The Windows Event log states the following error message: "Replication: expired subscription dropped." You must get the latest data in the user's database and make sure that future data changes are appropriately replicated. So what action should you perform to achieve this goal? （）
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