$61.\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_,\_\_\_\_\_\_\_\_\_\_\_\_\_,$ and $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ are common impurities found in refinery feedstock, which can adversely affect refinery operations and product quality. $($a$)$ Sulfur, nitrogen, oxygen $($b$)$ Mercury, lead, arsenic $($c$)$ Carbon, hydrogen, oxygen $($d$)$ Methane, ethane, propane

$62.$ The production of $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_,\_\_\_\_\_\_\_\_\_\_\_\_\_\_,$ and $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ involves various processes such as steam cracking and catalytic reforming to convert hydrocarbons into valuable petrochemical precursors. $($a$)$ Ethylene, propylene, butylene $($b$)$ Acetylene, butadiene, styrene $($c$)$ Methanol, ethanol, propanol $($d$)$ Synthesis gas, hydrogen, methane

$63.\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_,\_\_\_\_\_\_\_\_\_\_\_\_\_,$ and $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ are essential feedstocks for the production of synthesis gas, which serves as a key intermediate in the synthesis of methanol, ammonia, and hydrogen. $($a$)$ Natural gas, coal, biomass $($b$)$ Crude oil, petroleum gas, shale oil $($c$)$ Ethylene, propylene, butylene $($d$)$ Ethane, propane, butane

$64.$ The primary function of $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_,\_\_\_\_\_\_\_\_\_\_\_\_\_,$ and $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ in petrochemical processes is to provide the necessary energy for various chemical reactions and processes. $($a$)$ Steam, heat exchangers, catalysts $($b$)$ Pressure vessels, distillation columns, reactors $($c$)$ Hydrogen, oxygen, carbon dioxide $($d$)$ Boilers, turbines, furnaces