- secondary reduction
- 二次破碎
English-Chinese dictionary of mining (英汉矿业大词典). 2013.
secondary reduction
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Secondary stress — is the weaker of two degrees of stress in the pronunciation of a word; the stronger degree of stress is called primary . The symbol for secondary stress is a short vertical line preceding and at the foot of the stressed syllable: IPA|… … Wikipedia
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Reduction of nitro compounds — The chemical reactions described as reduction of nitro compounds can be facilitated by many different reagents and reaction conditions. Historically, the nitro group was one of the first functional groups to be reduced, due to the ease of nitro… … Wikipedia
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