The candidate choice and preparation requirements of certified reference materials are introduced.

介绍标准物质候选物的选择与标准物质的制备要求。

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The DB2 9 exam preparation brochures make it easy to understand the certifications and their requirements.

阅读 DB2 9 考试准备手册 可以帮助您轻松地了解各种认证及其要求。

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Preparation before working: observe whether the area is accord with requirements before working. Pull on parking brake after parking.

作业前的准备：作业前要观察场地是否符合要求。停车后要拉上驻车制动器。

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Streamlining should be undertaken as well with respect to congressional requirements for duplicative reports whose preparation consumes immense amounts of staff and executive time seemingly unjustified by their use on Capitol Hill.

CENTERFORSECURITYPOLICY: 'Transformation, part deux'