材料用具:紫色洋葱、显微镜、载玻片、盖玻片、吸水纸、滴管等.
供选择的试剂:清水、质量浓度为0.1g/mL的KNO3溶液、质量浓度为0.3g/mL的蔗糖溶液、质量浓度为0.5g/mL的蔗糖溶液.
豆类、动物肝脏中含有丰富的铁和锌,这里的“铁”、“锌”是指( )
根据对话内容回答问题
A: Hello! Is that Mike?
B: No. This is Tom.
A: Hi, Tom. This is John. How are you?
B: Fine, thanks.
A: Is Mike in?
B: Sorry, he isn't. He's at school.
A: OK. Thank you. Bye—bye!
B: Bye!