Question

introduction
working under a car thats supported properly by jack stands.
a jack stand is completely mechanical and sturdily constructed. as a result, the chances of a jack stand failure is very small. in spite of its relatively low weight, a jack stand can support a relatively heavy load.
why is the chance of a jack stand failure very small?
a jack stand is made from a single piece of steel.
because the weight of the axle stand is relatively low.
a jack stand is completely mechanical and sturdily constructed.
check

Explanation:

The text states that a jack - stand is completely mechanical and sturdily constructed, which is given as the reason for its low failure rate.

Answer:

A jack stand is completely mechanical and sturdily constructed.