作业帮请问 ladder spreader 是什么东西这是上下文：Prior to using a step ladder,the following is to be checked: the ladder spreader is not damaged or missing and the locking mechanism is operable; the ladder spreader has not
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请问 ladder spreader 是什么东西这是上下文：Prior to using a step ladder,the following is to be checked: the ladder spreader is not damaged or missing and the locking mechanism is operable; the ladder spreader has not
请问 ladder spreader 是什么东西
这是上下文：
Prior to using a step ladder,the following is to be checked:
the ladder spreader is not damaged or missing and the locking mechanism is operable;
the ladder spreader has not been replaced with rope or chain;
请问 ladder spreader 是什么东西这是上下文：Prior to using a step ladder,the following is to be checked: the ladder spreader is not damaged or missing and the locking mechanism is operable; the ladder spreader has not
别瞎说了各位!
ladder spreader的意思是梯子中间的连接部分（A字形梯子有两个梯子连在一起,中间A的横杠部分就是ladder spreader)
如图中18号部分
Prior to using a step ladder, the following is to be checked:
the ladder spreader is not damaged or missing and the locking mechanism is operable;
the ladder spreader h...
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Prior to using a step ladder, the following is to be checked:
the ladder spreader is not damaged or missing and the locking mechanism is operable;
the ladder spreader has not been replaced with rope or chain;
在使用之前的一个步骤梯子，以下是有关方面进行检查：
阶梯摊铺机是不被损坏或遗失的，并锁定机制可操作性;
阶梯摊铺并没有被替换钢丝绳或链条;
收起
是可伸缩梯
阶梯吊具,相当于吊蓝