通常的玻璃夹砂管分为三大层：内衬层、（）、和表面层。
The Testking corporate LAN consists of one large flat network. You decide to segment this LAN into two separate networks with a router. What will be the affect of this change?（） [" The number of broadcast domains will be decreased."," It will make the broadcasting of traffic between domains more efficient between segments."," It will increase the number of collisions."," It will prevent segment 1's broadcasts from getting to segment 2."," It will connect segment 1's broadcasts to segment 2."]
要获得洁净的蒸气，必须降低锅水的（） ["排污量","加药量","含盐量"]
在SQL Server 2000系统中，当指定基本表中某一列或若干列为主码时，则系统将在这些列上自动建立一个唯一值、聚集和非空的索引。
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