Abstract : through on - the - spot test and theoretical calculation , the re gular pattern that the used hot - blast parameters of the grain drier change with the variation of working conditions was revealed 文摘:经理论计算及现场试验，揭示了粮食干燥机废气参数随其工作条件的改变而发生的规律性变化。
2.
For hoods with shutters in four sides , the results show : 1 ) the hoods positively placed boards are called hoods used for venting airflow ; hoods negatively placed boards are called hoods used for leading airflow ; 2 ) among the hoods used for venting airflow , the most effective hoods should have positive declining angle value of 30 , the ratio 4 of areas between the four windward faces and the gular section ( fy / fj = 4 ) , the value of b range from 70 mm to 120 mm and the value of b / h range from 0 . 5 to 0 . 6 ; 3 ) the most effective hoods should have negative declining angle value of 60 , the ratio 4 of areas between the four windward faces and the gular section ( fy / fj = 4 ) , the value of b range from 100 mm to 170 mm ( the optimum value is 120 mm ) and the value of b / h range from 1 . 4 to 2 . 2 ( the optimum value is 2 . 0 ) 对于四面设百叶型风帽，计算表明: l )正装倾斜挡板的百叶型风帽可认为是排风型风帽，倒装挡板倾斜的百叶型风帽可认为是进风型风帽; 2 )排风型风帽中，挡板正装30 ” 、风帽四个迎风面的有效面积fy和风管净断面积fj的比值( fy肠)为4 、挡板宽度b在70inln到120inln之间、板间距比值陇在0 . 5到0 . 6的百叶型风帽排风效果最好; 3 )进风型风帽中，挡板倒装装60 “ 、风帽四个迎风面的有效面积和风管净断面积的比值( fy例)为4 、挡板宽度b在100咖到170mm之间( 120mm为最佳) 、板间距比值陇在1 . 4到2 . 0的进风型风帽( b爪= 2 . 0为最佳)的百叶型风帽进效果最好。
3.
Abstract : the adding and spelling of suffix to words in english ha ve their re gular features and rules . in some cases , there are changes in roots of words . inot her cases , there are changes in suffixes . it is necessary for english learners to know these rules and changes one by one in order to acquire them efficiently , then utilize them freely in study 文摘:英语后缀的添加与拼写有其特点与规则，某种情况下，词根部分要发生变化，某种情况下，后缀部分要发生变化，这就需要学习者一一掌握，才能准确、有效地掌握词汇，从而达到举一反三的效果
4.
Methods : among these 32 patients with narrow nasal valve , 10 were operated with anterior inferior turbinectomy , 4 with deviation orthopedic of protruding trian gular outer cartilage ( 2 on the left , 2 on both sides ) , 6 with bone - widen operation of osseous pyriform aperture ( 2 on the left , 4 on both sides ) . the nasal ventilation before and after operation was observed 方法: 32例鼻瓣膜区狭窄患者,行下鼻甲前端切除术10例,鼻外侧软骨凸出矫正术4例(左侧2例、双侧2例) ,骨性梨状孔狭窄扩大术6例(左侧2例、双侧4例) ,观察手术前后鼻通气改善情况以判定疗效。
