By analysing the stress of each point on the dangerous sections of throwing shuttle rod, we put forth the theory that what material should be used to make it.
通过对投梭棒危险截面上各点的应力分析，提出理论要求上应采用什么材料制造。
The point is that breaking free of Earth's gravity will no longer require so much energy — perhaps 100 times less than launching the space shuttle.
最主要的是，摆脱地球引力将不再需要那么多的能量——也许还不到发射航天飞机所需能量的1％。
The Shuttle accident, tunnel drilling equipment , mining equipment, cranes, leakage at the loading point of an offshore operation etc.
航天飞机事故，隧道钻探设备，小型设备，起重机，海岸渗漏等等。
The Shuttle accident, tunnel drilling equipment , mining equipment, cranes, leakage at the loading point of an offshore operation etc.
航天飞机事故，隧道钻探设备，小型设备，起重机，海岸渗漏等等。
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