求翻译：起重机属于起重机械的一种，是一种作循环、间歇运动的机械。一个工作循环包括：取物装置从取物地把物品提起，然后水平移动到指定地点降下物品，接着进行反向运动，使取物装置返回原位，以便进行下一次循环。是什么意思？

The crane is a lifting machinery, the machinery of a cycle, intermittent motion. A work cycle include: extract the device from the extract items filed, and then move horizontally to the specified location down the items, followed by the reverse movement, extract device returns in situ for the next c

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The hoist crane belongs to the hoisting machinery one kind, is one kind makes the circulation, the intermittent motion machinery.An operating cycle includes: Takes the installment from to take the thing to mention the goods, then the level moves to the assigned location lowers the goods, then carrie

正在翻译，请等待...

正在翻译，请等待...