ARTIFICIAL RUBIES AND SAPPHIRES HAVE THE SAME HARD AND COMPOSITIO...

543. - LUYEN THI TOIEC 870 CAU TRAC NGHIEM 543. - LUYEN THI TOIEC 870 CAU TRAC NGHIEM
LUYEN THI TOIEC 870 CAU TRAC NGHIEM
543. Artificial rubies and sapphires have the same hard and composition as the real stones. A B C DAnswer. 538. (A) 539. (D) 540. (A) 541. (C) 542. (D) 543. (C)