Lucy and Lily are twins . They are 13 years old . They look the same . But they have different hobbies . Lucy likes collecting stamps . She has many beautiful stamps . They're from different cities and countries . But Lily likes growing flowers . The flowers are all very beautiful . Lucy and Lily both like reading books . Lucy likes reading storybooks . But Lily likes reading science books . On Sunday , they usually ride bikes to the park . They can play with their friends there . Sometimes their parents go there , too .

将磁性氧化铁放入稀HNO₃中可发生如下反应：3Fe₃O₄+28HNO₃=9Fe （NO₃）_x+NO↑+14H₂O．下列判断合理的是（   ）