๐๐จ๐ฐ ๐๐๐ข๐๐ง๐๐ ๐๐จ๐ซ๐ค๐ฌ
Author: Judith Hann, 192 trang, bรฌa cแปฉng, tรฌnh trแบกng tแปt
Suggests simple experiments that demonstrate facts about chemical reactions, energy, motion, light, sound, air, water, magnetism, electricity, electronics, and computers
150.000VND
Sแบฃn phแบฉm tฦฐฦกng tแปฑ
