cylinder head spacer plate 缸盖间隔板
head-to-spacer 缸盖至间隔垫
Gemini surfactant is a new type of surfactant, with molecules made up of two amphiphilic moieties covalently connected at the level of the head group by a spacer.
双子表面活性剂是一类新型的表面活性剂，其分子由化学键通过联接基团将两个单链表面活性剂的离子头联接构成。
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