???? 
 
??????
?? ?? ?? 
?????? 
??? Standard 
????GB/T3639 
????GB/T8713 
 
??????
 
????DIN2391-2 
????HK15-2000 
????
????? Uses 
?????????????е???????豸????????? 
?????? 
?????? 
???? 
| ?????? | 
???? | 
? ?? | 
| ???? / ? | 
BK | 
????????????????????????????????к?С????? | 
| ???? / ?? | 
BKW | 
??????????????С?????????????????????????????????????Σ????磺??????????? | 
| ?????? 
?????????????? | 
BKS | 
??????????? Ac 1 ??????????????????????? | 
| ??? | 
GBK | 
??????????????????????????е??????? | 
| ???? | 
NBK | 
??????????????????????????е????? | 
????????????1 
??????????????????:[(??-???)*???]*0.02466=kg/??(????????)