Question

                                                                                

（1）     富含的营养素是     ；(2)                 其主要目的是    

                                                  

      牛奶、鸡蛋                        食品包装时充氮                                          

                                                                                          

(3) 缺少         肥（填化肥种类），该类化肥可增强作物           能力                                                                                                                                     

                                                                                                                                                                  

                                                                                                                            大豆叶边缘发黄                                                                               

                                                                                       

（4）洗涤剂的作用是                                  。                                                                                        

用洗涤剂洗碗

Answer 1

剖析  牛奶、蛋类富含的营养物质是蛋白质；氮气的化学性质稳定常用作食品保护气；大豆叶边发黄，是植物体内钾元素含量过少，植物新陈代谢缓慢，钾元素能促进植物生长、增强抗病虫害和抗倒伏能力；洗涤剂能将餐具上油污乳化成细小的油滴，起到乳化作用。

答案  （1）蛋白质 （2）防止食品腐败 （3）钾（或K）  抗病虫害和抗倒伏 （4）乳化作用