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油藏物理学一岩石粒度组成与比面 average grain size: how to got it? d,:average grain diameter d,d; respectively sieve hole diameter in two adjacent layer.) 1 1 ( 2 1 1 ' '' i di di d   how to got it? respectively sieve hole diameter in two adjacent layer. :average grain diameter i d ' i d '' di 油藏物理学——岩石粒度组成与比面 average grain size:
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