Which of the following is a common feature of rolling contact bearings?

Rolling contact bearings are specifically designed to reduce friction between moving parts, and they achieve this through the incorporation of balls or rollers. These elements roll along the raceways instead of sliding, which significantly decreases the friction generated during operation. This design element is crucial because it allows for smoother movement and higher efficiency in mechanical systems.

In contrast, the other options do not accurately describe the key characteristics of rolling contact bearings. For example, while fluid lubrication may be used in conjunction with these bearings, it is not a defining feature; some rolling contact bearings can be lubricated using grease. The notion of high friction due to sliding action is inapplicable, as it is the rolling action that primarily defines them and minimizes friction. Lastly, isolation from load applications is not a common feature, as rolling contact bearings are designed to support loads and facilitate motion, rather than isolate from them. Therefore, the incorporation of balls or rollers stands out as a defining and common feature of rolling contact bearings.