A shuttle on the launch pad measures 184 feet (56 meters) tall from the tip of the external tank down to the aft skirts of its twin solid rocket boosters.
从外部燃料箱的顶端至船尾固体火箭助推器的裙摆，发射台上的航天飞机高184英尺(56米)。
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When the hydraulic system up to the tip is set higher than the pressure relief valve, the relief valve on top of the ball was opened by the oil relief valve to the tank platoon.