packing board
... packaging board：包装用纸板 packing board：垫圈纸板 preventive maintenance：预修，防护性维护 ...
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... 垫子;缓冲装置;纸张弹性：cushion 垫圈纸板：gasket board 垫圈纸：gasket paper ...
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无皮带轮的发电机运输时得有一个薄纸板制作的管或是安装上垫圈以防运输时转子损坏内部零件。
All alternators that are shipped with out pulleys are to have a cardboard tube or spacers installed to as to prevent the rotor from damaging internal components during shipping.
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