某同学进行实验,甲图为实验开始状态,乙图为实验结束状态。请在乙图所示实验结果的基础上继续实验,探究蔗糖的水解产物能否通过半透膜。

增添的实验材料:蔗糖酶溶液、斐林试剂、试管、滴管、水浴锅等。
(注:蔗糖酶可以催化蔗糖水解为单糖)
(1)设计出继续实验的简要步骤:
①向a、b两管分别加入                                    ,水浴加热(或隔水加热)U型管至适宜温度,观察                                     的变化;
                                                                                                                                                 
(2)预测实验现象并作出结论。
                                                                        
                                                                     
                                                                         
                                                                     

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