短语词组短語bismuth -germanate glass and fiber 鉍鍺酸鹽玻璃及光纖bismuth germanate crystal 鍺酸鉍晶躰copper doped bismuth germanate 摻銅鍺酸鉍bismuth silicate -germanate crystal 矽鍺酸鉍晶躰 返回 bismuth germanate