The most complex part of RFCC is in the feed injection zone.
提升管的进料段是裂化反应最复杂的区域。
Polymer is a very expensive material and the injection process is a long complex process.
聚合物是一种昂贵的化学产品，并且其注入是一个漫长而复杂的过程。
Polymer is a very expensive material and the injection process is a long complex process.
聚合物是一种昂贵的化学产品，并且其注入是一个漫长而复杂的过程。
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