Discovery was hours from launching on it final voyage to the ISS on November 5 when technicians found a hydrogen leak and later a series of long cracks on the shuttle's external fuel tank.
一开始技术人员发现有氢气泄漏，后来在外部燃料罐上发现了一些裂缝，当时是11月5日离发现号前往国际空间站的发射前的几小时，这是它的最后一次飞行。
At 5, 500 light years distant, Cat's Paw is an emission nebula with a red color that originates from an abundance of ionized hydrogen atoms.
5500光年远处，猫爪星云是一个发射星云，红色来源于其丰富的电离状态的氢原子。
In the case of hydrogen fuel cells, storing the hydrogen in gaseous rather than liquid form improves the efficiency by 5%.
在这个案例中，存储氢燃料电池在气态氢液体状态，而不是提高效率的5%。
Soluble lead sulfide can be extracted from the residue by 10% hydrogen peroxide, 15% ammonium acetate and 5% acetyl hydrate.
用10%过氧化氢—5%醋酸—15%醋酸铵浸取上述残渣，可浸取溶解硫化态铅；
Synthesis of 2, 3, 5 - Trimethylhydroquinone by Direct Oxidation Using Hydrogen Peroxide.
过氧化氢直接氧化法合成2,3,5 -三甲基氢醌。
The diluting gas is hydrogen, argon or nitrogen. The mol ratio of carbon source to diluting gas is 0.5-5.
稀释气体为氢气、氩气、氮气，碳源与稀释气体的摩尔比在0．5～5范围内；
The mechanisms dealing with the thermal decomposition of 5-nitro-1- hydrogen-tetrazole are studied by density function theory.
利用密度泛函理论研究了5-硝基-1-氢-四唑分子热分解的反应机理。
So 5 ~ 10 million kilowatt above the steam turbine generator adopts the cooling effect good hydrogen cold or water-cooling system.
所以5 ~ 10万千瓦以上的汽轮发电机都采用了冷却效果较好的氢冷或水冷技术。
So 5 ~ 10 million kilowatt above the steam turbine generator adopts the cooling effect good hydrogen cold or water-cooling system.
所以5 ~ 10万千瓦以上的汽轮发电机都采用了冷却效果较好的氢冷或水冷技术。
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