【简答题】多肽链中氨基酸的 称为一级结构,主要化学键为 。
【简答题】多肽链中氨基酸的 ( ) 称为一级结构,主要化学键 ( )
【单选题】Up to 40 per cent of the chemical energy of the burning fuel changed into mechanical energy.
【简答题】By cutting out the middle man and booking your own flights, you can save up to 40 per cent of the cost of a holiday. If you compare this to the price of a hotel stay, the【66】(save) can be even more im...