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- 初戀的疼Kiss婷 2018-04-26 00:00:00
- 應(yīng)該說各有長處，但是上英語課或沒有筆記本電腦的人就不能只用電子詞典。
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熱門問答
- 各位談?wù)動(dòng)⒄Z學(xué)習(xí)者是用電子詞典好還是用印刷版的詞典
2018-04-25 03:36:11
417
1
- 各位談?wù)動(dòng)⒄Z學(xué)習(xí)者是用電子詞典好還是用印刷版的詞典好?
- 各位談?wù)動(dòng)⒄Z學(xué)習(xí)者是用電子詞典好還是用印刷版的詞典好?... 各位談?wù)動(dòng)⒄Z學(xué)習(xí)者是用電子詞典好還是用印刷版的詞典好? 展開
2008-10-17 02:56:47
337
4
- 電子詞典會(huì)取代印刷詞典嗎?
2011-10-29 01:11:40
720
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- 幫忙翻譯下化工的英語。。用在線詞典翻譯部正確
- A reversed-phase ion-pairing high-performance liquid chromatography (RP-HPIPC) method for the separation of a complex mixture of heparin-derived oligosacchrides has been developed by a stepwise optimization of the mobile phase， in which the... A reversed-phase ion-pairing high-performance liquid chromatography (RP-HPIPC) method for the separation of a complex mixture of heparin-derived oligosacchrides has been developed by a stepwise optimization of the mobile phase， in which the concentration of ion-pairing reagent， mobile phase pH， and acetonitrile concentration were varied. The resolution of more than 30 oligosaccharide components was obtained， under optimized conditions， in an analysis time of less than 30 min. This represents the first RP-HPLC method that can separate a complex mixture of both small and large sulfated oligosaccharides in a single chromatographic step. The heparin-derived oligosaccharides， in this mixture， can also be separated under a second set of RP-HPIPC conditions using a volatile ion-pairing reagent， tributylammonium acetate， to aid in the recovery of individual sulfated oligosaccharides. Moreover， it was possible to replace sodium chloride gradient， required for eluting highly sulfated oligosaccharides， with a fixed， low concentration of a volatile salt， ammonium acetate， by utilizing an acetonitrile gradient. This solvent system might make it possible to directly interface this RP-HPIPC separation with mass spectral analysis. ??2003 Elsevier B.V. All rights reserved. Keywords: Ion-pairing reagents; Gradient elution; Oligosaccharides 展開
2010-06-01 05:49:52
691
4
- 單反的液晶屏是用保護(hù)膜好還是用保護(hù)罩好？
- 如題，具體型號(hào)∶SONY a350，可折疊式液晶屏。用哪一種比較好？
2013-09-22 02:39:55
641
4
- 是用銅片好還是導(dǎo)電橡膠好
2018-03-29 08:16:42
417
3
- 封陽臺(tái)是用玻璃膠好還是用結(jié)構(gòu)膠好
2017-06-21 04:18:20
767
6
- 筆記本電腦是用交流電好還是直流電好？
- 換句話說筆記本是插著電源線用電好還是沖滿了拔下電源線直接用電池供給好... 換句話說 筆記本是插著電源線用電好 還是 沖滿了拔下電源線直接用電池供給好 展開
2013-09-17 13:23:53
1037
5
- 單片機(jī)是焊的好還是用面包板的好
2018-02-17 13:11:47
531
1
- 機(jī)器視覺的二次開發(fā)，是用labview 好還是用C，C#，VB好？
- 機(jī)器視覺的二次開發(fā)，是用labview 好還是用C，C#，VB好？我想學(xué)習(xí)用labview做，請(qǐng)問對(duì)采集卡有什么需求？
2013-11-10 17:21:31
1340
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- 機(jī)器視覺的二次開發(fā)，是用labview 好還是用C，C#，VB好？
2017-08-20 15:52:47
708
2
- 電極刷用鎢絲的好還是用銅絲的好
2016-09-29 11:03:14
784
1
- 用投影儀看電視是用無線的好還是手機(jī)同屏的好？
2017-12-14 20:18:06
329
1
- 調(diào)速器是用比例閥還是伺服電機(jī)好
2017-07-09 16:57:13
459
1
- 我是女孩用英語怎么說？
2016-02-16 01:36:48
525
7
- 鋼結(jié)構(gòu)行業(yè)用玻璃棉好還是用巖棉好
2017-12-24 15:50:25
395
1
- 液壓泵維修用試驗(yàn)臺(tái)好還是用測試儀好？
2015-01-30 08:05:38
541
1
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