Hinh 2.1D. Mdt qua edu nhidm
dien, mdt qua edu khdng nhidm
dien.2.7. Hay giai thfch tai sao d eae xe xi tee chd ddu ngudi ta phai ldp mdt chidexich sdt cham xud'ng da't.2.8. Treo mdt sgi tdc trude man hinh eua mdt may thu hinh (tivi) chua hoatddng. Ddt nhien bat may. Quan sat hien tugn[r]