问题描述：
[单选]
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．
A．正确
B．错误
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答案解析：无
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上一篇：连续作业流动性强，装卸位置变化范围大。Continuous operation has strong mobility， and the loading and unloading location can be changed in a large range．
下一篇：搬运是指物体在任何地方进行空间移动的过程。Handling refers to the process of spatial movement of objects in any place．
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