本课题在分析常规弧焊技术特点的基础上，选取熔透式低频直流等离子弧焊电源作为成形的热源。
In basis of analyzing the features of the conventional arc welding technology, a DC low-frequency plasma welding power with fusion penetration is selected as the heat source for metal forming.
研究单透棚和双透棚两种棚式性能及对西洋参生育生理、产量品质的影响。
The study compared the performance, growth, physiology, American ginseng yield and quality of Light-Rain transmission and light transmission shed.
方法：采用整群抽样法，用SF - 36量表对杭州市4家血透中心的181例血透患者进行自评量表式调查。
Methods: By a cluster sampling procedure, 181 hemodialysis patients from 4 hemodialysis centers in Hangzhou completed the SF 36 Scales with self administration.
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