Points out that the cubic law of pump power is not valid for the cooling water system of central air conditioning for it is an open system. The static head should be the lift in a cooling tower.

指出集中空调冷却水系统为开式系统，一般不适用功率三次方定律，静压头应为冷却塔塔体扬程，并提出了冷却水泵变速时轴功率的计算公式；

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One common problem OEMs have had with promotion forecasting is that most use static lift factors that may be weeks or months old, and may only provide the resolution or visibility at a high level.

OEM促销预测中的一个常见问题是大多数都使用静态增量因素，它们可能已经用了几周或几个月，并且可能只提供高层次的分解力 或可见性。

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It has a static lift-weight ratio of 0.2-0.8 and thus requires relatively low minimum flying wind force, and this results in more kite flying chance and ever elegant fly effect.

气球以粘贴、网罩或镶嵌的方式与风筝结合成一体。轻体风筝的静态升重比为0．2―0．8，降低了对放飞最小风力的要求，使放飞活动有更多的机会可选择。

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