【简答题】在三个商品期货交易所中,任意选择一种商品作为你的分析目标,你选择哪一个品种?
【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?
【单选题】明度高的色有( )的感觉,明度低的色有( )的感觉
【单选题】表达式Int(2*sqr(36) +0.5)/3的值是( )。