金（Au）やプラチナ（Pt）などの貴金属は比較的比重が大きく、X線不透過性が高い上に、酸化や腐食に強い特徴を持つため、治療デバイスの部材 ...
Investopedia / Michela Buttignol The real economic growth rate, or real GDP growth rate, measures economic growth, as expressed by gross domestic product (GDP), from one period to another ...
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