作接种用的“种子”，最好取自典型生长曲线上（）的培养液 ["延滞期","对数期","稳定期","衰亡期"]
You are a professional level SQL Server 2005 database administrator in an international corporation named Wiikigo. You are experienced in implementing high-availability solutions， monitoring the database server， and design deployment. In the company， you major job is the deployment， maintenance and support of Microsoft SQL Server 2005. You work as a database administrator for your company. A SQL Server 2005 application is utilized by the company. A query is executed by the application to return three columns of the nvarchar data type and one column of the XML data type. A WHERE clause is utilized by the query， and all three of the nvarchar columns are contained by the WHERE clause. 5 million rows are included by the table， and 50，000 rows are returned by the query. The performance of the query should be enhanced. Which action should be performed to achieve the goal？（） ["A primary XML index should be created on the XML column.","Statistics should be created on the nvarchar columns.","A view should be created， and only the four columns that the query utilizes are contained by a view.","A composite index should be created on the three nvarchar columns， and INCLUDE should be specified for the XML column."]
适用于砂砾石地基处理的方法有（） ["A.开挖 ","B.防渗墙 ","C.排水法 ","D.设水平铺盖 ","E.预浸法"]
一般毒性作用根据接触毒物的时间的长短又可分为急性毒性、（）和慢性毒性。 ["致突变毒性","生殖毒性","免疫毒性","亚慢性毒性"]
设备的有形损耗率相当于（）。 ["设备实体损耗程度与全新状态的比率","设备实体损耗额与全新状态的比率","设备实体损耗程度与重置成本的比率","设备实体损耗额与重置成本的比率"]
风机中哪些地方用到弹性支承，弹性支承的作用是什么？
