| inverse proportion | 0.25 |
| remain constant | 0.47 |
| belong to second interv… | 0.35 |
| belong to first interva… | 0.33 |
| vary with each change | 0.28 |
| decrease with load | 0.25 |
| adapt to increase the m… | 0.25 |
| use pwm | 0.25 |
| vary for other embodime… | 0.25 |
| approach the speed of l… | 0.25 |
| correspond to known sta… | 0.25 |