关于poppet的文学精选
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poppet造句
Thecheckvalvepoppetassemblyshallbeguidedviatheuseofacorrosionresistantplasticguide.Inthiscaseaproportionalsolenoidisusedtopushapoppetagainstaseatviaaspring.Sheisaquietbuthard-workinggirl.Shehasagoodmo...