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简述格式塔理论的完型组织原则。

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从哪朝以后，“中国”一词才逐渐演变为正统朝代的标志？（）

A. 南北朝
B. 汉朝
C. 北宋
D. 金

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企业有哪些可以选择的外汇风险融资手段？

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915/925芯片组与865/875芯片组相比，增加了对（）的支持。

A. Hyper-Threading处理器超线程技术
B. 性能加速技术
C. PCI Express
D. 1066MHz的前端总线

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Your developers have created table to store some of their program's data. After examining the slow Query Log, you see that they are using the LIKE operator and SUBSTER () functions against a VARCHAR (10000) column quite often. An example of the start of one row of data: 'GREEN01020495888331993-12-10/2…' What should you do to improve the overall performance?（）

A. Convert the column to TEXT and add a fulltext index to the table
B. Create multiple prefix indexes of differing lengths
Convert their column to BINARY
D. Redesign the table so that the most commonly searched for string patterns are in their own colum

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