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【简答题】
某硅胶对N 2 的吸附符合BET公式，已知1.5g硅胶上的吸附定斜率=5.35dm -3 ，截距=0.206dm -3 (STP)若N 2 的截面积为16.2×10 -20 m 2 ，试计算此硅胶的比表面积。
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