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1·Some common marpol oil treatment technique are discussed in the article.

因此，文章讨论一些常用的船舶废油处理技术。

2·Additional, in MARPOL Reg 12a the demand of Double Hull Protection for fuel oil tank, increases the difficulty of structure design for engine room.

加之MARPOL 12 A条款要求对燃油舱设置双壳保护，给机舱的结构设计增加了难度。