Extraction code: idrb Zhejiang 20 17 Self-made Teaching Aids Appraisal (Primary School Science Group) |76 (Science) Arch, Dome and Sphere |75 (Science) Petal Heatable Cup |74 (Science) Submarine |73 (Science) Swing Research Device |72 (Science) Air Occupation Space Demonstrator | 762. Wearable circuit detector |67 "Can fish swim fast with a spindle-shaped body?" Experimental device |66 Where is the magnetic force of the magnet |65 Multifunctional demonstrator of the causes of the four seasons |64 Where does the water drop come from |63 Demonstration instrument of sound, light and electric energy conversion.