$33.$ The $5-95$ gap in distillation is a measure of the $\_\_\_\_$ range over which most of the crude oil is distilled, impacting $\_\_\_\_$ planning and $\_\_\_\_$ optimization.

$34.$ The degree of difficulty of separation $($t$50)$ in distillation provides insight into the $\_\_\_\_$ required to separate key crude oil components, affecting $\_\_\_\_$ efficiency and $\_\_\_\_$ yield.

$35.$ Packie charts are utilized to optimize distillation $\_\_\_\_$ points, improving the refinery's ability to meet product $\_\_\_\_$ specifications and maximize $\_\_\_\_$ recovery.

$36.$ Effective desalting of crude oil removes impurities such as $\_\_\_\_$ and $\_\_\_\_,$ enhancing the quality of the final products and reducing $\_\_\_\_$ in processing equipment.