Does the throttle opening represent the engine load?

1. Throttle opening represents engine load (√).

2. The mixing ratio of standard mixture is the most ideal, so the engine has the largest power and the best economy (×).

3. When the main oil supply device is in a medium or small load condition, with the increase of load, the mixed gas gradually becomes thicker (×).

4. The function of the carburetor idle device is to supply less and thick mixture (√) to the cylinder.

5. The working time of the vacuum concentration device depends on the vacuum behind the throttle (√).