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Speleology
Speleology (also spelled spelæology or spelaeology) is the scientific study of caves and other karst features, their make-up, structure, physical properties, history, life forms, and the processes by which they form (speleogenesis) and change over time (speleomorphology). The term speleology is also sometimes applied to the recreational activity of exploring caves, but this is more properly known as caving, spelunking or potholing. Speleology and caving are often connected, as the physical skills required for in situ study are the same. Speleology is a cross-disciplinary field that combines the knowledge of chemistry, biology, geology, physics, meteorology and cartography to develop portraits of caves as complex, evolving systems.
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共軛的閥齒輪
Transportation; Railway
拉杆的運動的其它兩個氣瓶閥齒輪驅動的方式經營的三缸閥系統。其最著名的版本,在英國是由 H.N.Gresley 大北和防水鐵路從 1922年他 3 缸機車使用,通過一些其他鐵路世界範圍內的。移動部件的數目減少它,雖然其最嚴重的缺點是所產生的拉杆,導致過度磨損的鞭子效果。 ...
連接杆
Transportation; Railway
活塞杆連接驅動輪或驅動橋上曲柄的鋼臂。,它用於轉換的軸旋轉運動向前和尾部的活塞運動。它在圓錐的表單設計,有小結束,它連接活塞杆,與它相連曲軸臂的 '大端' 十字 。減少趨勢是允許的曲柄結束時經歷過的更大的壓力。 ...
薩達姆敢死隊
Law enforcement; Terrorism
伊拉克的准軍事組織說是相當於納粹的"SS"。民兵是忠於薩達姆 · 侯賽因,負責使用上不是忠於薩達姆的政策的平民的暴行。他們不會穿制服穿衣服的 ...