Policies and procedures that are effective and efficient must be in place for the proper conduct and control of the project commitment.

有效的和高效的策略和程序必须符合对项目的适当指导和对项目承担义务的适当控制。

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Valves are produced in a variety of design types and materials. Proper selection is important to ensure the most efficient, cost effective and long lasting system.

阀门的结构和采用材料多种多样。为了确保效率最高，成本最合理，系统使用寿命最长，阀门的正确选型非常重要。

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To maintain the proper operation of the power system, an effective, efficient and reliable protection scheme is required.

为了保持电力系统，有效，高效和可靠的保障计划正常运行是必需的。

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