While the rocket is inside, technicians will remove and inspect suspected helium system components, update any faulty hardware, and perform other work. That includes replacing batteries in the flight termination system — the emergency system that can destroy the rocket if it strays off course — swapping out a seal on the line that feeds liquid oxygen into the rocket, refreshing items inside Orion, and giving the closeout crew more practice sealing the capsule.
; RETF (protected mode) — execution flows DOWN this listing，这一点在Line官方版本下载中也有详细论述
，详情可参考safew官方下载
As a beginner, I expected the arms and hands to flail around, knocking the blocks and cups around the room.。夫子是该领域的重要参考
Stuart RustSouth of England