An intelligent robot uses ____ to detect changes in the work environment.

As pressure is applied to air, its volume ______________________________.

The categories of opto-electronic devices include ____.

The rotary motion of shafts, gears, and pulleys is measured by ____ sensors.

In fluid power systems, friction is called ____.

What is the primary focus of public relations (PR)?

Fluid pumps convert the force of moving fluid into rotary motion using ____.

A transducer converts light, heat, or mechanical energy into ____.

Write a sentence using the following word: unskilled

Choose the best vocabulary word for the sentence:  Learning English is very _____________________, but it is worth the time and energy.