RO保安过滤器的额定出力（）m3/h 70。 72。 180。
You are upgrading the database servers that are used by all of the companys applications. As the first step in the upgrade, you upgrade the development database servers. You need to verify that the upgrade of the database servers did not introduce any errors into the databases. What should you do?（） Execute unit test scripts for each stored procedure in each database.。 Execute the stored procedures in the SQL Server Management Studio debugger, and verify the results.。 Set the database compatibility level on the database servers to 80.。 Execute the application user interface test scripts to verify proper operation.。
引起原发性血小板增多症血栓形成的原因，下列哪项是最重要的（） 血小板粘附和聚集功能降低。 血小板释放反应增强。 凝血机理减低。 抗凝血机理减低。
A support engineer reports that inserting new sales transactions in a SQL Server 2005 database results in an error. You investigate the error. You discover that in one of the databases, a developer has accidentally deleted some data in a table that is critical for transaction processing. The database uses the full recovery model. You need to restore the table. You need to achieve this goal without affecting the availability of other data in the database. What should you do?（） Back up the current transaction log. Restore the database with a different name and stop at the point just before the data loss. Copy the table back into the original database.。 Back up the current transaction log. Restore the database to the point just before the data loss.。 Restore the database from the existing backup files to a time just before the data loss.。 Restore the database to the point of the last full backup.。
完整的毒理学评价通常可划分为（）等四个阶段的试验研究，并结合人群资料进行。 急性毒性试验。 亚急性毒性试验和致突变试验。 亚慢性毒性试验和代谢试验。 慢性毒性试验和致癌试验。
下列属于宏观市场环境的有（）。
