... polybag undershot 胶袋走料不到 undershot-type wasteway 下冲式废水渠 undershot water wheel 下冲式水轮 ...
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... 熄火保护装置 flameout protection device 下冲式水轮 undershot wheel 下风式风力机 down-wind type of WECS ...
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undershot wheel
undershot water wheel
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