Lifting and shoring part includes procedures covering maintenance, overhaul and repair, removal and replacement, as well as abnormal conditions such as belly landing, nose landing, etc.
AA. 顶升和支撑部分包括维护
BB. 顶升和支撑部分包括维护
CC. 顶升和支撑部分包括维护程序，大修和维修，拆卸和更换，以及比如腹部着地