upper bend 中文意思是什麼

upper bend 解釋
背斜
  • upper : adj 1 （更）上面的，上方的，上部的；較高的；上級的；（議會）上院的；（衣服）穿在外面的。2 上流的...
  • bend : vt （bent 〈古語〉 bended bent 〈古語〉 bended）1 弄彎，使彎曲，拗彎（棍子等）；屈（膝）；彎（弓...
  1. Neither the upper bend of the don, nor the crucial land bridge, had been secured.

    上游的頓河河曲和關系重大的陸口橋梁此時都未到手。
  2. The joint or bend of the arm between the forearm and the upper arm

    肘關節上臂與前臂之間的關節或胳膊彎曲處
  3. It ` s suitable for the bend and deformation of the metal plates and it can roll the round and arcshapes and the cone ones within its specified ranges. it has the function of prebending the plate at both ends. the two lower rollers are the driving ones and can make the horizontal movement ; and the upper is a driven one and can make the up and down movement. the moving manner includes the mechanical and industry, boilers, shipbuilding, metal structure, machine manufacture and other trades, especially for the roll the steel trunks with smaller diameter and longer length in power transmission and trandform and other trades

    該機適用於金屬板材的彎曲成型，可卷制圓形，弧形和一定范圍的錐形工作，並有板材端部預彎功能，本機型兩個下輥為主動輥並可水平移動，上輥為從動輥上下移動，移動形式有機械式和液壓式，傳動軸均採用萬向連軸器連接，它廣泛適應于石油化工鍋爐造船金屬結構及機械製造行業，特別適用於送變電行業等直徑較小長度較長鋼管桿的卷制
  4. 3. bend your upper body slightly forward and clasp your hands around one knee

    3 .雙手抱住一個膝蓋，上身向前彎曲。
  5. This means that the dielectric property changes with height and allows a slight increase in the speed of a radio wave as we move upwards through the atmosphere. this in turn means that if a radio wave moves away from the earth at an angle less than 90 degrees, then the upper part of the wave travels faster than the lower part. therefore even under normal conditions this can in effect bend, or refract, the wave back down to earth

    其中一種顯著的現象是：在一定的氣象條件下，在大氣邊界層尤其是在近地層中傳播的電磁波，受大氣折射的影響，其傳播軌跡彎向地面，當曲率超過地球表面曲率時，電磁波會部分地被陷獲在一定厚度的大氣薄層內，就好像電磁波在金屬波導管中傳播一樣，稱為大氣波導傳播，形成波導傳播的大氣薄層稱為大氣波導層。
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