Question

adjustable wrench
the adjustable wrench, sometimes referred to as a \crescent wrench\ (made popular by the brand name crescent) can be set to the size of the bolt or nut, by turning the spindle. this type of wrench is often used for large bolts and nuts, or when the correct size wrench is unavailable.
a well - fitting box - end or open - end is always preferable over an adjustable wrench; because due to its adjustable design, there will always be a certain amount of free play. this play can cause the adjustable wrench to lose grip, resulting in the wrench slipping off the bolt or nut. when this happens, both the tool and the nut or bolt can be damaged.
3
what is special about the adjustable wrench?
the adjustable wrench accommodates a number of sizes, by using an adjustable spindle.
the adjustable wrench is suitable to loosen bolts that are very tight.
the adjustable wrench renders other wrenches obsolete.

Explanation:

The text states that an adjustable wrench can be set to the size of the bolt or nut by turning the spindle, which means it can accommodate a number of sizes. It is also mentioned for use when the correct - size wrench is unavailable, but there is no indication it is best for very tight bolts or makes other wrenches obsolete.

Answer:

The adjustable wrench accommodates a number of sizes, by using an adjustable spindle.