排水系统布置应遵循的原则有()。 排水沟道要处于控制面积的最低处,以求尽量自流排水。 根据地形应将排水地区划分为高.中.低等片,做到高水高排,低水低排,自排为主,抽排为辅。 排水干沟的出口应选择在容泄区水位较高和河床比较稳定的地方。 排水沟布置要避开土质好的地带,以节省工程费用并使排水安全及时。 在有外水入侵的排水区,不应布置截流沟或撇洪沟。
In your datawarehousing application, you generate reports frequently. The data is static in the tables being used to generate reports. You are currently using joins, resulting in a large performance overhead. What kind of database structure would you use to reduce the response time of the query?() hash clusters。 index clusters。 partitioned tables。 index-organized table (IOT)。
某语文老师认为学会学习很重要,因此在班上进行阅读的教改,他把阅读技能分解成若干有条理的小步骤,通过活动实例示范各个步骤,要求学生按步骤活动,并经过反复练习使之达到自动化程度,一段时间之后,学生的阅读学习效果得到了显著提高;但仍有6位成绩差的学生在老师的教改期间成绩没有改善。让学生学会学习,其最核心的部分是让学生()。 学会知识。 学会技能。 学会学习策略。 形成正确态度。
A customer has purchased a new IBM Storwize V7000 storage array and is considering an IPbased DR replication solution that is cost-optimized and provides a near instant recovery option fortheir Microsoft Exchange application and server. The backup site is 30 kilometers away. Whatwould be the best choice for replication?() Storwize V7000 Metro Mirror。 Tivoli Storage ManagerFastBack。 Storwize V7000 Reverse FlashCopy。 Tivoli Storage Productivity Center for Replicatio。
A customer wants to migrate their existing compute-intensive POWER6 570 to a Power 770. Which of their existing I/O adapters can be migrated to Power 770 enclosures?() PCIe adapters。 PCI-X adapters。 PCI-X andPCIe adapters。 PCI, PCI-X andPCIe adapter。
表现房地产的自然特性是()。