two-filament bulb

Introduces and compares two control methods for economic operation of outdoor air system in AC by CAV: outdoor air dry bulb temperature control method and enthalpy control method.

介绍和比较了定风量空调系统中实现新风系统经济运行的两种控制方法：按室外空气干球温度进行控制的方法和按室外新风焓值与室内空气焓值进行比较的控制方法。

The results of two models resistance tests for single screw cargo ship with block coefficient about 0.67, with and without bulb-bows, is analysed.

本文对两艘方形系数为0.67左右的单桨货船加装球鼻的阻力试验结果进行了分析。

Two live wire contacting points on the sliding plate are in flat form, which reduces resistance force when the bulb is screwed, and the bulb is uneasy to be damaged.

滑动板上的两个火线触点为平面形的，使拧装灯泡时阻力小不易损坏；

Endogenous ZR content in daughter bulb was higher from bud stage to half withered stage and decreased evidently after that, which in mother bulb had the different changes between two species lily bulbs.

百合现蕾直至植株半枯期，新鳞茎中内源ZR处于较高水平，半枯期后显著下降，母鳞茎中ZR的变化趋势2种百合有所不同。

The dry bulb temperature, wet bulb temperature and relative humidity of the air in entrance to the air conditioner influence upon the temperature falling. humidifying capacity, cooling efficiency and humidifying efficiency of two different fill air conditioners were analyzed in detail.

系统分析了进口空气干、湿球温度和相对湿度对两种不同填料空调机温降、加湿量、冷却效率及加湿效率的影响。