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底砂 背砂 填砂
floorsand
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填砂,背砂
filler sand
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加砂填砂设备
sanded-uequipment
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背砂
back-up sand backing sand
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底砂
floor sand
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填砂
blinding sand filling in floor sand packing sand sand filling sandfilling&n...
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砂填层
choked layer of sand
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炉底砂
bottom sand
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砂填充物
sand fillings
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地面砂,背砂
floor sand
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充填砂
back up sand backing sand placing sand
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回填砂
sand backfill
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填砂的
sand-filled
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填砂框
sand frame sand-filling frame
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填砂柱
sandpack column
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打底砂浆
bed mortar
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底砂过滤式
undergravel
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底砂收集器
bed load trap bedloadtrap
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