The study calculates that the plant has facilitated about six tonnes of weapon-grade or 90% enriched uranium.
该研究算出，这一工厂已经生产了大约6吨军用的或90%浓度的浓缩铀。
The letter said the plant would not enrich uranium beyond the 5% level suitable for civilian energy production. That would be substantially below the threshold of 90% or more needed for a weapon.
信中说，该工厂只生产适合于民用能源项目的浓缩铀，纯度将不会超过5%的水平，这将大大低于制造武器所需的90%或以上水平的门槛。
Special Qualities: Plant, Weapon Immunity, Fire Resistance.
特别性质：植物，武器免疫，抗火性。
The study calculates that China's Lanzhou plant, operating continuously at full capacity up to 1980, would have facilitated about six tonnes of weapon-grade or 90% enriched uranium.
该研究算出：在满负荷运转情况下，截止到1980年，中国的兰州厂生产了大约6吨军用的或90%浓度的浓缩铀。
The study calculates that China's Lanzhou plant, operating continuously at full capacity up to 1980, would have facilitated about six tonnes of weapon-grade or 90% enriched uranium.
该研究算出：在满负荷运转情况下，截止到1980年，中国的兰州厂生产了大约6吨军用的或90%浓度的浓缩铀。
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