When using the ion exchange column, pay attention that the liquid level should not be lower than the resin, otherwise bubbles will appear in the exchange column.
举一反三
- According to the interest rate parity theory, when the forward foreign exchange rate is premium, it means that the domestic interest rate( ) A: is equal to the foreign exchange rate B: lower than foreign exchange rates C: higher than foreign exchange rates D: Not sure
- 1、In general, the relationship between cash exchange rate and spot exchange rate is ( ) A: The selling price for cash is lower than the selling price for foreign exchange B: The purchase price for cash is lower than the purchase price for foreign exchange C: The purchase price for cash is higher than the purchase price for foreign exchange D: The selling price for cash is higher than the selling price for foreign exchange
- You are modifying a table named Product in a SQL Server 2005 database. You want to add a new column named FriendlyName to the Product table. A friendly name for each product will be stored in this column. The table currently contains data. Thesales department has not yet created a friendly name for each product. FriendlyName is a required value for each product. You want to add this new column by using the least amount of effort. What should you do？（） A: Define the new column as NUL B: Update the FriendlyName column to the same valueas the productName column. Alter the FriendlyName column to be NOT NUL C: D: Define the new column as NOT NULL with a default value of ’Undefined.’ E: Define the new column as NUL F: Use application logic to enforce the data constraint. G: Define the new column as NULL with a default value of ’Undefined.’
- What should you also pay attention to when starting a used baby equipment business? The__________________of the babies using the equipment.
- When shopping, we should pay attention to ______.