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service structure
A service structure, or supply tower or launch tower, is a structure built on a rocket launch pad to facilitate fueling and loading of cargo and crew into a spacecraft.
A supply tower also usually includes an elevator which allows maintenance and crew access. Immediately before ignition of the rocket's motors, all connections between the tower and the craft are severed, and the bridges over which these connections pass often quickly swing away to prevent damage to the structure or vehicle. In contrast with launch towers, service structure towers do not guide rockets as they lift off.
Service structures generally consist of fixed components and mobile ones.
==Examples==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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