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It can obtain dropping characteristic when AC, welding current waveshape is rapid zero-crossing square wave, it is propitious to welding current and arc stability. 交流时可获得陡降外特性，焊接电流波型为迅速过零的方波，有利于焊接电流和电弧稳定。
Experimental studies were carried out to investigate the air-side heat transfer and pressure drop characteristics of a novel louvered fins and flat tube beat exchanger. 摘要对9种不同结构参数的新型开窗翅片进行传热和流动阻力性能试验。
Using compressed air as working medium,heat transfer and pressure drop characteristics of compressed air in mixed Chevron bellow s plate heat exchanger were tested. 以现场的压缩空气为实验工质，对压缩空气在人字形波纹板式换热器的传热与流阻性能进行实验研究。
An experimental study of frictional pressure drop characteristics of R410A-oil mixture flow boiling inside straight and C-shape horizontal enhanced tubes was performed. 实验研究了环保制冷工质R410A-润滑油混合物在直强化管和C形强化管内流动沸腾的摩擦压降特性。
The bulk characteristics of the PHE w ere evaluated from heat transfer and pressure drop characteristics,heat transfer efficiency,compactness and economic characters etc. 此外还从传热与流阻性能、传热效率、紧凑性和经济性等方面对板式换热器的整体性能进行了评价。
Comparison of end wall heat transfer and pressure drop characteristics was made between two kinds of rectangular clapboards and two kinds of waved clapboard in the turbine bl. 主要讨论了在通道其它结构均相同的条件下分别采用4种不同结构的隔板(2种孔径的矩形隔板与2种孔径的波形隔板),研究隔板中孔径大小对通道换热和流阻的影响。
The old man is dropping away in the sofa. 这位老人在沙发上打起瞌睡来。
The hydrodynamic experiments with countercurrent flow of gas and liquid simulating the flow conditions in the lower zone of the blast furnace were carried out in a packed bed to clarify the gas pressure drop characteristics in that zone. 摘要为了阐明高炉下部气相压降的特性，在填料床内模拟高炉下部流动条件进行了气液两相逆流的流体力学实验。
Sympathy is the feeling characteristic of mankind. 同情心是人类特有的感情。
The airplane was attacked by dropping bombs. 这架飞机遭到炸弹的袭击。
I tripped over, dropping the tray I was carrying. 我绊了一下，手中的托盘掉在地上了。
The experimental study and numerical simulation on heat transfer and pressure drop characteristics were performed at the shell-side of a coaxial-pipe heat exchanger with helical baffles. 以水-润滑油换热为对象,对螺旋隔板套管换热器的壳程传热与压降性能进行了实验研究与数值模拟。
He spoke with characteristic enthusiasm. 他以特有的热情说话。
The airside heat transfer and pressure drop characteristics of slit fin-and-tube heat exchangers with hydrophilic coating were studied experimentally under dehumidifying conditions. 对带亲水层条缝型翅片管换热器在析湿工况下的空气侧特性进行了实验研究。
Her predominant characteristic is honesty. 她最为突出的特点是诚实。
Men were dropping like flies in the intense heat. 人们抵受不住酷热而纷纷倒下。
Characteristic of or befitting a warrior. 勇敢的，好战的具有战士、勇士特征的或适宜于勇士的
He said he would drop her like a hot potato. 他说他会把她像烫手的东西一样迫不及待地扔掉。
The rain is leaking in large drop through the roof. 雨正大滴大滴地从屋顶漏下来。
Heat transfer and pressure drop characteristics of petal shaped fin tube and low finned tube heat exchanger with helical baffles were introduced,in which compressed air folwing in the shell side. 螺旋隔板是强化管壳式换热器壳侧传热十分有效的壳程结构型式。