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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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彈藥技工説明器
Professional careers; Occupational titles
專業人員協助彈藥技工檢查、 維護、 存儲和使用彈藥的材料,如槍、 引物、 熔斷器、 地雷、 炸彈、 火箭、 導彈、 坦克、 彈藥和武器火控設備的準備。* 如傭工主標題下所述,執行其他職務。 ...
業務和商業機維修工
Professional careers; Occupational titles
作為專業人士,這一組包括與修復計算有關的職業,簿記,定址,抄襲,和相關的機器,包括手動和電動打字機和現金註冊。* 銷售和服務的職業都包括在組 275 ;並在組 722 和組 823 包括電子資料處理設備。 ...