【简答题】In all forms of chromatography there is a mobile phase and a stationary phase. a) In thin layer chromatography what is the stationary phase? b) In thin layer chromatography what is the mobile phase?
【简答题】表达式 Not 13 Mod 3 = 1 Or 5 Mod 2 4的值是__________。
【判断题】The stationary phase of GC is solid.
【单选题】In normal phase partition chromatography, the stationary phase commonly used is ( )
【单选题】表达式Int(2*sqr(36) +0.5)/3的值是( )。