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美国最近曾径把金属放在相当于离地面800公里高度的真空室内进行许多试验.结果发现许多金属在这种条件下经受疲劳强度的能力大大提高了.例如,铝提高到5～8倍.科学
The United States has conducted many experiments in the past with metal placed in a vacuum chamber at a height of 800 km above the ground and found that the ability of many metals to withstand fatigue under such conditions has been greatly enhanced, for example, with aluminum up to 5 to 8 times higher. science