secondary expansion 中文意思是什麼
secondary expansion
解釋
（使用時膨脹）二次膨脹-
It can be used not only to change the fire precision of the base bleed projectile, but also to improve the effect of reduction drag and expansion range. the calculating model of the secondary expansive pressure of the burning gas is constructed by means of analysis of the experimental resuits, it has been confirmed that the new base bleed unit can be designed, with the secondary expansive principle of the burning gas pressure. the engineering project of a hybrid base - bleed - rocket high - level efficient extended - range projectile is designed, with the secondary expansive principle of the burning gas pressure, the feasibility and the true worth of its engineering applications is validated in theory
本文提出了底排燃氣壓力不隨外部壓力變化，既可改善底部彈射擊精度又可提高減阻效果的二次擴張原理，建立了底排燃氣二次擴張壓力的計算模型，並通過採用二次擴張原理的新型底排裝置與傳統底排裝置的對比試驗，驗證了新型底排裝置結構實現的可行性；完成了基於底排燃氣二次擴張高效增程原理的底排?火箭復合高效增程彈方案設計及其有關計算，從理論上驗證了其工程應用的可行性和實際價值。 -
Third, the theory and formulations about the stress redistribution due to creep and shrinkage of composite section and the secondary internal forces which are caused in hyper static structure, the self - stressed force and the secondary internal forces due to expansion, are studied, program is compiled by use of formulations studied above and it is used to analyze sensors that are installed during the course of work
再次，探討了收縮徐變作用下組合截面應力重分佈以及在超靜定結構產生次內力和膨脹變形引起自內力和次內力計算理論及公式，編制了相應程序，對加固過程中埋設的傳感器進行了分析計算。 -
The experimental results indicates that the secondary mass flow increases with increasing of primary mass flow rate, but the bypass decrease because the primary mass flow rate increase more rapidly than secondary mass flow. the expansion configuration shows low thrust property due to low pressure in flow path. the secondary nozzle changes the pressure distribution in ejector combustor, and decreases bypass ratio, but obtain more completely mixing
結果表明：二次流流量隨著一次流流量的增加而增加，由於二次流流量的增加速度低於一次流，引射系數減小；在純擴張式結構實驗中，引射燃燒室壓強很低，難以實驗推力增強；二次噴管改變了引射燃燒室的壓強分佈，降低了引射系數，改善了混合狀況能；對于本文的實驗結構，存在一個最優的二次噴管出口面積，使引射火箭推力最大，同數值模擬結果相吻合。 -
Upon the ongoing relocation of the lower value - added and less skill - intensive manufacturing processes to the mainland, as well as the strong expansion in service activities in hong kong, the tertiary services sector has overtaken the secondary sector since 1981 to become the largest employer in the economy
隨增值較少及技術要求較低的製造業生產工序陸續移往內地進行，以及香港的服務業迅速擴展，自一九八一年? ，第三級生產行業已取代第二級生產行業成為香港的最大僱主。 -
With the on - going relocation of lower value - added and less skill - intensive manufacturing processes to the mainland and steady expansion of service sector activities in hong kong, the tertiary services sector has long overtaken the secondary production sector to become the largest employer in the economy
隨增值較低及技術密集較少的製造工序逐漸移往內地進行，香港服務行業不斷擴大，第三級服務行業早已取代第二級生產行業，成為各經濟行業中的最大僱主。 -
So even if the birthrate should rise somewhat, little expansion is possible for elementary and secondary school enrollments
因此，即使出生率有所上升，中小學入學人數不可能有大的增長。
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