反相HPLC常用的固定相是______，流动相是______，这时候混合样品中极性大的组分______(填先或后)出柱。
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According to Jeff Gilbert, the "advisory" classes at Hillsdale were set up so that students could ______.
A. tell their teachers what they did on weekends
B. experience a great deal of pleasure in learning
C. maintain closer relationship with their teachers
D. tackle the demanding biology and physics courses
业主大会成立前，已售公有住房住宅专项维修资金专户按()。
A. 物业管理区域为单位设账，按幢设分户账
B. 物业管理区域为单位设账，按房屋户门号设分户账
C. 售房单位设账，按幢设分户账
D. 幢设账，按房屋户门号设分户账
指示电极(indicator electrode)
常见的质谱图形式为______图，使用最多的电离源是______。
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