Chemical Process
Sucrose is a disaccharide consisting of

Fructose and galactose
Glucose and galactose
Glucose and glucose
Glucose and fructose

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Chemical Process
Liquefaction of gases can not be done by

Merely compressing it beyond critical pressure
Adiabatic expansion against a piston or in a turbine
Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
Exchange of heat with colder stream

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