Differential acting hammer
... 流差 Difference，current 差动锤 Differential acting hammer 差动桩锤 Differential acting pile-hammer ...
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短语
差动汽锤
differential acting steam hammer
差动桩锤
Differential acting pile-hammer
差动打桩锤
differential-acting pile hammer
差动椿锤
Hammer pile differential-acting
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