Mrs. Stewart added: “When we comb her hair we have to lay her down and cover her head with water to stop any static building up.”

莎朗太太补充说：“如果要给她梳头发，我们就得先让她躺下来，用石毛巾裹住头发，这样才不会产生静电。”

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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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