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84 mL water  
15.5 mL HNO3                                 
0.5 mL HF   
3 g CrO3

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stepbystep,comeon.
4Â¥2013-04-25 12:03:10
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thansome

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4Â¥: Originally posted by feiniaohong at 2013-04-25 12:03:10
84 mL water  
15.5 mL HNO3                                 
0.5 mL HF   
3 g CrO3

¸¯Ê´20-60s

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