词条„niobium“在英语 » 中文中的译文

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opium

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sodium

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单语范例（未经PONS编辑处理）

英语

Niobium has physical and chemical properties similar to those of the element tantalum, and the two are therefore difficult to distinguish.

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Two layers were made of niobium, the third of lead-indium-gold alloy.

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The region also has one of the largest niobium reserves in the world.

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The free element is not found in nature, but niobium occurs in combination with other elements in minerals.

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The province is also the world's second largest producer of niobium and the third of titanium dioxide.

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There are 20 parts per million of niobium in the earth's crust, making it the 33rd most abundant element there.

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The temperature stability of niobium-containing superalloys is important for its use in jet and rocket engines.

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Potash, uranium, niobium, iron ore, lead, zinc, diamonds, marble, and phosphate have also been discovered, and several deposits were being exploited commercially.

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Subsequently, there was considerable confusion over the difference between columbium (niobium) and the closely related tantalum.

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The complex includes a uranium deposit and a large reserve of rare earth elements, zirconium, niobium and beryllium.

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