但由于严重地影响涂料和胶料的粘结作用，所以一般不单独使用。
They are not widely used on their own as they tend to severely affect coating and glue adhesion.
C9石油树脂一般不单独使用，而是作为促进剂、调节剂、改性剂和其它树脂一起使用。
Generally, the resins are not used independently, but have to be used together with other kinds of resins as promoters, adjusting agents and modifiers.
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