本文描述了多联式空调机能效国家标准的制定原则、能效指标和测试要求。
In this paper, the national energy efficiency standard for multi-connected air conditioner unit was introduced, including the principle, energy efficiency indexes and testing requirements.
使用现有的产品数据表达与交换标准STEP只能描述CAD模型几何、拓扑和部分运动学信息，对多刚体动力学特征的描述一直是特征模型中的一个空白。
But there are only basic info of geometry, topology and partial kinematics in the CAD model in STEP. The description on feature of multi-rigid-body dynamics is hardly blank.
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