This article describes drainage design principle for planted roof, and puts forward that increasing drainage gradient of both roof and growing medium layer could speed up water discharge.
叙述了种植屋面的排水设计原则，提出可通过加大屋面排水坡度和种植介质表面排水坡度等措施，达到快速排放屋面积水的目的。
The high-speed digital frequency mixer made of medium-scale integrated circuits and the design of a high power transistor amplifier are also presented.
介绍了高速中规模集成数字频率合成器、晶体管高频大功率放大器的设计。
In this paper, the design basis, calculation method and construction feature of the new type composite oil ring with helical spring used in the medium and high speed diesel engine are described.
本文介绍了一种中、高速柴油机上使用的螺旋弹簧式组合油环的设计依据、计算方法及结构特点，总结了在120型柴油机上的试验结果。
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