当数据库管理器确定顺序I/O是适当的，并且确定预取操作可能有助于提高性能时，会使用预取操作（通常是大型表扫描）。
Prefetching is used when the Database Manager determines that sequential I/O is appropriate and that prefetching can help to improve performance (typically large table scans).
论文主要研究应用于全数字超声诊断设备中的高性能数字扫描变换系统。
This dissertation mainly studies the high-performance digital scan conversion system applied in the digital ultrasound diagnostic equipment.
由等离子体反射面天线构成的雷达系统，是一种多功能、高性能的新型电扫描雷达系统。
The radar with the unique advantages of plasma reflector antenna is a new, multi-functional, high-performance electronic scanning radar system.
此款高性能单窗口扫描仪利用专利优化器，通过翻转一个开关可将扫描仪从水平位置转到垂直位置。
This high performance, single window scanner leverages the patented optimizer to convert the scanner from the horizontal to the vertical position with just the flip of a switch.
高性能计算机断层扫描(CT)能够在40秒之内即可完成整个机体的扫描，能够显示任何病变。
Total body Scans Produced in Only 40 seconds High-performance computed tomography (CT) can scan an entire human body in just 40 seconds and is able to show anything that is problematic.
对数字扫描变换器中的插补算法进行分析，提出了基于CPLD技术的硬件实现方案，实现了一种高性能的数字扫描变换器。
The interpolation algorithms applied in DSC are analyzed. The design of hardware system based on CPLD is presented. A new DSC with high performance is implemented.
该雷达光栅扫描显示系统具有高性能、低成本、功能强、易于维修和功能扩展等特点。
The system has high performance, low cost, strong function and eas to maintain and extend for function.
该雷达光栅扫描显示系统具有高性能、低成本、功能强、易于维修和功能扩展等特点。
The system has high performance, low cost, strong function and eas to maintain and extend for function.
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