護背距離 的英文怎麼說
中文拼音 [hùbēijùlí]
護背距離
英文
guard rail face gage- 護 : 動詞1. （保護; 保衛） protect; guard; shield 2. （袒護;包庇） be partial to; shield from censure
- 背 : 背動詞1. （用脊背馱） carry on the back 2. （擔負） bear; shoulder
- 距 : Ⅰ名詞1 （距離） distance 2 （雄雞、雉等的腿的後面突出像腳趾的部分） spur （of a cock etc ）Ⅱ動詞...
- 離 : Ⅰ動詞1 （離開） leave; part from; be away from; separate 2 （背離） go against 3 （缺少） dispens...
- 距離 : 1 （相隔的長度） distance; range; gap; space; spacing; separation 2 （相距） be apart from; be aw...
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There is no thoroughly rounded theory about displacement ventilation system in our country at present and our research begins recently. the study work of this paper will be useful for further optimization design of displacement ventilation system. this dissertation includes five parts. the first part introduces the development of the displacement ventilation and the background of research in domestic and oversea. in the second part, it gives working principle of displacement ventilation system and it ’ s advantages to the mixture ventilation. the study also gives a series of indexes to evaluate displacement ventilation system and specifies air supply terminal device and so on. it is needed to simulate and analyse the velocity field, temperature field and distribution of flow field. this is the third part. the forth part specifies the simulative method for thermal stratification of displacement ventilation system. it gives some factors affecting thermal stratification height such as inlet temperature, inlet velocity, heat transfer of wall body, distance of heat source and so on
本文的研究工作主要包括以下幾個方面的內容: （ 1 ）綜述了國內外相關的研究現狀和研究背景; （ 2 ）簡介了置換通風的工作原理，並分析了它相對于混合通風的優良特性及評價指標、末端裝置等; （ 3 ）對採用置換通風方式房間的溫度場、速度場和氣流分佈進行了模擬計算與分析; （ 4 ）對採用置換通風方式房間的熱力分層高度進行了模擬計算，並分析其影響因素，如:送風溫度、送風速度、圍護結構傳熱和熱源分佈等; （ 5 ）擬合了無量綱熱力分層高度相應于送風溫度t 、送風速度v 、熱源間距離l和圍護結構傳熱q的經驗公式。To maintain so large number of pipeline will coat enormously. as a result, the method to test pipeline in long range economically and effectively is needed
要維護如此龐大數量服役管道，所要耗費的人力、物力是難以計數的，由此，迫切需要一種高效、經濟可靠的長距離管道檢測技術，本文所要解決的問題即是在這樣的工程背景下提出的。According the special application background of the single source and the short line in the 110kv power system, the author proposed a feasible protective scheme, in which the power frequency variation distance protect theory with combination to the four - lateral distance relay is used as quick and mainly theory
本人針對110kv單電源短線路這一特殊應用背景，提出了以工頻變化量距離保護為快速主保護，結合四邊形三段式相間和接地距離保護的保護原理方案。
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