英語問題 有沒有英語相當(dāng)好的 有好的來幫幫忙 發(fā)揮一下你的才能
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要求專業(yè)的老師 或 同學(xué)幫忙翻譯以下專業(yè)名稱的英文單詞 把中文翻譯成英文 要正確的哦 材料設(shè)備試劑清單: 做金材料設(shè)備:1,十萬分之一電子天平一臺(奧豪斯這個牌子的比較好用),2,架盤天平(1000克) 3, 馬弗爐(18升和8升的各一臺,一個... 要求專業(yè)的老師 或 同學(xué)幫忙翻譯以下專業(yè)名稱的英文單詞 把中文翻譯成英文 要正確的哦 材料設(shè)備試劑清單: 做金材料設(shè)備:1,十萬分之一電子天平一臺(奧豪斯這個牌子的比較好用),2,架盤天平(1000克) 3, 馬弗爐(18升和8升的各一臺,一個化驗(yàn)室夠用) 4, 振蕩器 水浴鍋 電熱板 5 ,方形瓷舟 50毫升瓷坩堝 坩堝鉗 6, 滴定臺 滴定管 試劑:對苯二酚 純金999(1-3克) 聯(lián)苯胺 磷酸二氫鉀 磷酸 無水乙醇 氯化鉀 做銀:耐火粘土坩堝(500毫升) 電子稱 上述1,2,3,種設(shè)備也要用到 灰皿 鐵模(自制) 試劑:無水碳酸鈉 硼砂 二氧化硅 淀粉 氧化鉛 鉛鋅連測:乙二胺乙酸二鈉 純鉛 純鋅 氟化鉀 硫代硫酸鈉 硫酸鉀 溴素 硫脲 過氧化氫 無水乙酸鈉 冰乙酸 次甲基藍(lán) 二甲酚橙 抗壞血酸 定量濾紙(慢速) 漏斗 燒杯(250毫升) 銅的測定:純銅 氟化氫銨 硫氰酸鉀 硫酸鐵銨 醋酸銨 碘化鉀 錐形瓶(250毫升) 展開
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- 想你好糾結(jié) 2013-03-15 00:00:00
- It is too difficult,you know?
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- 偃師夙莘 2013-03-21 00:00:00
- 大約晚上12點(diǎn)到午夜
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- 英語問題 有沒有英語相當(dāng)好的 有好的來幫幫忙 發(fā)揮一下你的才能
- 要求專業(yè)的老師 或 同學(xué)幫忙翻譯以下專業(yè)名稱的英文單詞 把中文翻譯成英文 要正確的哦 材料設(shè)備試劑清單: 做金材料設(shè)備:1,十萬分之一電子天平一臺(奧豪斯這個牌子的比較好用),2,架盤天平(1000克) 3, 馬弗爐(18升和8升的各一臺,一個... 要求專業(yè)的老師 或 同學(xué)幫忙翻譯以下專業(yè)名稱的英文單詞 把中文翻譯成英文 要正確的哦 材料設(shè)備試劑清單: 做金材料設(shè)備:1,十萬分之一電子天平一臺(奧豪斯這個牌子的比較好用),2,架盤天平(1000克) 3, 馬弗爐(18升和8升的各一臺,一個化驗(yàn)室夠用) 4, 振蕩器 水浴鍋 電熱板 5 ,方形瓷舟 50毫升瓷坩堝 坩堝鉗 6, 滴定臺 滴定管 試劑:對苯二酚 純金999(1-3克) 聯(lián)苯胺 磷酸二氫鉀 磷酸 無水乙醇 氯化鉀 做銀:耐火粘土坩堝(500毫升) 電子稱 上述1,2,3,種設(shè)備也要用到 灰皿 鐵模(自制) 試劑:無水碳酸鈉 硼砂 二氧化硅 淀粉 氧化鉛 鉛鋅連測:乙二胺乙酸二鈉 純鉛 純鋅 氟化鉀 硫代硫酸鈉 硫酸鉀 溴素 硫脲 過氧化氫 無水乙酸鈉 冰乙酸 次甲基藍(lán) 二甲酚橙 抗壞血酸 定量濾紙(慢速) 漏斗 燒杯(250毫升) 銅的測定:純銅 氟化氫銨 硫氰酸鉀 硫酸鐵銨 醋酸銨 碘化鉀 錐形瓶(250毫升) 展開
- 哪位英語高手幫幫忙,翻譯英語文章!謝謝1
- 英語高手,謝謝了!ThecatalystsupportwasimpregnatedwithacetonesolutionofRuCl3.nH2Ouptorutheniumcontentof4w%,understirringfor6h.Afterconcentrationinarotaryevaporator,theobt... 英語高手,謝謝了! The catalyst support was impregnated with acetone solution of RuCl3.nH2O up to ruthenium content of 4 w%, under stirring for 6 h. After concentration in a rotary evaporator, the obtained material was dried in air at 383 K overnight and subjected to preliminary reduction with a 1N2/3H2 stream at 698 K, and then cooled in 1N2/3H2 atmosphere. The potassium promoter was introduced by incipient wet impregnation with KNO3 solution at room temperature with molar ratio of K+ /Ru = 5/1. After stirring for 6 h and infusing for 24 h, the samples were dried in a rotary evaporator at 343K and then dried in the air at 383K for 12 h. The ammonia synthesis activities of the catalysts with about 35-60 meshes were evaluated by 1N2/3H2 flow of 2100 mL/h at 0.2 MPa from 623 K to 773 K. The amount of effluent ammonia was determined by titration method. As we can see from the Table 1, under the same reaction conditions, the catalyst K-Ru/Mg(Al)O exhibited the highest activity, 38.42 mL NH3?h-1?g-1 at 673K, 3 times more active than K-Ru/MgO, 12.88 mL NH3?h-1?g-1 at 748K. This means that selection of supports takes great effects on the activity of catalysts. The ammonia synthesis activity of different supports are K-Ru/Mg(Al)O > K-Ru/Mg-Al-Ca(1) > K-Ru/Mg-Al-Ca(2) > K-Ru/Al2O3 > K-Ru/CaO > K-Ru/MgO. The combinatorial supports showed higher activity than single supports. However, the sequence of temperature corresponding to the highest activity is just opposite to that of the activity. The optimal temperature for K-Ru/Mg(Al)O, 673K, is the lowest of all, on the contrary, that of K-Ru/MgO is the highest, 748K. The Mg(Al)O has a larger surface area of 140.95 m2?g-1 , similar to γ-Al2O3, 110-180 m2?g-1 . The other two combinational supports have little surface areas but higher activities than Al2O3. It suggested that the activity of the catalyst is influenced not only by the dispersion of Ru crystals but also by the crystal structure of the supports. Table 1 Ammonia synthesis activities and BET surface areas Catalyst Optimal activity Highest activity Surface area of support temperature(K) (NH3/mL?h-1?g-1) (m2?g-1) K-Ru/MgO 748 12.88 K-Ru/Al2O3 698 23.79 K-Ru/CaO 723 23.22 K-Ru/Mg(Al)O 673 38.42 140.95 K-Ru/Mg-Al-Ca(1) 698 30.75 29.10 K-Ru/Mg-Al-Ca(2) 698 26.12 14.69 Acknowledgments This work was supported by the NNSF of China (20273053, 20023001 and 29933040), the 973 Programming (001CB108906) and the NSF of Fujian province (E0310001). References 1. C. J. H. Jacobsen, S. Dahl, P. L. Hansen et al., J. Mol. Catal. A, 2000, 163, 19. 2. F. Cavani, F. Trifiro, A. Vaccari, Catal. Today, 1991, 11, 173. 展開
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