A.珍珠 B.養(yǎng)殖珍珠 C.珍珠(處理)
A.玻璃 B.天然玻璃 C.合成玻璃
A.1.925—1.984,0.040 B.1.810-1.815,0.030 C.1.810-1.815,0.040