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有用的機(jī)械英語圖片 |
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交通標(biāo)示1
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交通標(biāo)示2
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交通標(biāo)示3
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交通標(biāo)示4
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螺母與螺栓
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螺母與螺栓2
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螺母與螺栓3
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螺栓與螺母各部分的英文名稱
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球形太陽能原理示意圖
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屋頂型式1
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