Through a series of testing method, this article introduces the selecting and purchasingmethods of high-speed machine tools.
通过一系列的测试方法，介绍高速切削机床的一般选购方法。
2
The General Services Administration is seeking information on potential sources to provide market research support on state and local purchasingmethods and programs.
通用服务管理署（GSA）正在寻求潜在资源信息以便为州和地方采办方法和项目提供市场研究支持。
3
Studies suggest that the Big Mac index fairly closely tracks the purchasing-power-parity rates calculated by more sophisticated methods.