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。
Though the fuels are frosty, upon ignition they generate scorching steam (5, 000 degrees) and plenty of thrust: Hydrogen is 40 percent more efficient than other propellants.
虽然极寒，而在点火后此燃料可以产生炽热的蒸汽(5000度)和足够的推力：氢比其它推进器燃料的效率高出40%。
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。
Theoretically, any biomass material with moisture content of 5-30% can be gasified as the basic composition of carbon, hydrogen and oxygen is same.
从理论上说，任何水分5-30％，生物质含量可以作为碳，氢，氧的基本组成气化是相同的。
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 Long March 5 has core stages fed by liquid hydrogen and liquid oxygen, another technology route to high specific impulse.
长征5有由液态氢和液态氧，另一种技术路线，高比冲美联储的核心阶段。
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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