By a special arrangement of the oxyhydrogen flame, by which the dissociation of the oxides into metal and oxygen is retarded, I have been able to volatilise completely the oxides of praseodymium, neodymium, and samarium, and to photograph their emission spectra between λ8000 and λ2400.
不配.
薰硝壤
Singularity
Leonardi
可靠的书桃
HEIKU
pcr163
完美的天空
paparazzi221
坚强亦丝
寻道图强
yufanhui
陈军
一一
豆豆
Yziii
8R60d8
tuanheqi
iNk
坚强的广山
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