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49、3 升降是指用起重机械吊起货物，通过垂直运动实现装卸。Lifting up and down refers to lifting goods with lifting machinery, loading and unloading are realized by vertical movement.
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C
更多 “49、3 升降是指用起重机械吊起货物，通过垂直运动实现装卸。Lifting up and down refers to lifting goods with lifting machinery, loading and unloading are realized by vertical movement.” 相关考题
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