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yadff新蟲(chóng) (初入文壇)
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【請(qǐng)教】請(qǐng)教寫(xiě)文章問(wèn)題
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The dark red crystals were picked out, washed with distilled water and dried at room temperature (31% yield based on W). Anal. Calcd for C20H22Cu2N4O42SiW12 (3351.65): C, 7.16%; H, 0.66%; N, 1.67%. Found: C, 7.24%; H, 0.75%; N, 1.60%. 文章里的水熱得到的晶體,31% yield basedon W,這個(gè)產(chǎn)率是怎么計(jì)算得到的啊,還有Calcd for C, 7.16%;H, 0.66%; N, 1.67%. Found: C, 7.24%; H, 0.75%; N, 1.60%.這些是怎么得到的啊。謝謝大家了。 |
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