???thi
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thif-312??????????????????????????????????,??????????????????????????????????,??????????????
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| ?? | ???? |
|---|---|
| ?? | ???? |
| ph? | 7.0-9.0 |
| ??(20?),g/cm3 | 1.06±0.02 |
| ?? | ???? |
| ??? | ? |
| ??? | ???? |
??????????????????????;????????????,?????????????,????????????????,??????????,?????????50-60??
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25kg?200kg/?,???????????,???????
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