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xfgzju: ½ð±Ò+15, ·ÒëEPI+1 2015-05-28 16:29:22
xfgzju: ½ð±Ò+15, ·ÒëEPI+1 2015-05-28 16:29:22
| When a piece of untreated limestone was exposed to 1L acid rain (for how long?) for 5 times, the final pH gradually decreased initially, then with time, it approached a constant pH. (ÓÃÁËÕâ¸öthen with time ±ÜÃâÌ«¶àgradually) |

2Â¥2015-05-28 16:10:02














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