$3.$True or False: The degree of separation $(5-95$ gap$)$ measures the temperature difference between the points where $5\%$ and $95\%$ of the material has been distilled off, and a smaller gap indicates a more complex separation.

True or False: The degree of difficulty of separation $($t$50)$ is a metric that shows the ease of separating crude oil fractions, and a higher value indicates an easier separation process.

True or False: Packie charts are used to determine the sulfur content of crude oil, and they are essential for planning desulfurization processes.

True or False: Desalting effectively removes all traces of heavy metals from crude oil, and it is the first step in the refining process to protect downstream units.