... internal area ==> 内域 internal area ratio ==> 内面积比 internal arithmetic ==> 内部运算 ...
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internal ratio standard area 内标面积
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Catalyst activity was determined by not only specific surface area of catalyst but also the distributions of active center and utilization ratio of internal surface.
催化剂活性不仅与比表面有关，还与其活性中心分布情况、内表面利用率有关。
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