Puede colocar una escalera en una entrada siempre que:
a. avise a todos los trabajadores que está subido a la escalera.
b. coloque una barricada o valla antes de subirse a la escalera.
c. cierre bien la puerta antes de subirse a la escalera.
d. coloque las cuatro bases de la escalera firmemente en el suelo.
Answer: B
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