The working length of a ladder is the distance between the foot and the

The working length of a ladder is the distance between the foot and the top support.

When using working ladder it is very important to take care of its length because of the safety and efficiency. The ladder should have the base 1 foot out from the surface it rests against for every 4 feet of height to that point.

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explanation:

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osteogenesis imperfecta (oi) refers to a congenital ailment of bones. in the condition, the bones become brittle or fragile. this ailment is a general result of the defect or mutations in the genes (colia1 or colia2). this mutation results in imperfect collagen formation either in quantity or quality wise.  

there are eight kinds of oi defects, and each kind varies with certain distinctions in symptoms. the usual symptoms include frequent bone fractures, loss of hearing in infants, protruding eyes, discoloration of the white in the eyes, respiratory issues, loosening of the joints, short stature, and other symptoms.