Al prolongar una escalera de extensión, jale de la cuerda hasta que la sección superior esté en la posición deseada y luego:
a. enganche bien el mecanismo de traba en el escalón deseado.
b. use la traba para asegurar bien el largo de la escalera.
c. use al menos dos abrazaderas para trabar la escalera en una posición estable.
d. ate la cuerda a un escalón para trabar la escalera en el largo deseado.
Answer: A
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