繩索資料，僅供參考
http://bloguide.ettoday.com/ropeaccess/
Figure-of-nine loop
http://ukcaving.com/board/index.php?topic=3315.msg43521
Rope Rescue
http://basarc.org/site/?q=roperescue
FM 3-97.61
https://atiam.train.army.mil/soldierPortal/atia/adlsc/view/altfmt/6714-1
TECHNICAL RESCUE EQUIPMENT AND TECHNIQUES
http://www.clmrg.org/ManCh4.html
