1. heat and ultraviolet rays 2. be solvent ethanol, organic solvents, such as acetone. 3. the possibility of acid – base (pH changes). 4. include the salts of heavy metals, such as Hg2 + + Pb2 + Ag. 5. x-ray radiation 6. the intense vibrations, settling
การแปล กรุณารอสักครู่..