项目建设背景：汽车发动机进排气阀座是各种汽车发动机的主要部件，目前该产品国内汽车生产厂家大部分从国外进口。
Project Background: the inlet and outlet valve seats of auto engine are main components of various auto engines and internal auto manufacturers import the product mostly.
项目建设背景：汽车发动机进排气阀座是各种汽车发动机的主要部件，目前该产品国内汽车生产厂家大部分从国外进口。
Project Background: the inlet and outlet valve seats of auto engine are main components of various auto engines and internal auto manufacturers import the product mostly.
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