permanent ballast是什么意思


中文翻译永外压载

网络释义

1)permanent ballast,永外压载2)permanent ballast,永久压载3)permanent ballast tank,永久性压载舱4)external load due to salt formation,岩压外载5)additional ballast water,额外压载水6)external water pressure,外水压力荷载

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