Engineering Thermodynamics
An adiabatic wall is one which

Discourages thermal interaction
Prevents thermal interaction
Permits thermal interaction
Encourages thermal interaction

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Engineering Thermodynamics
A closed system is one in which

Both energy and mass cross the boundaries of the system
Mass crosses the boundary but not the energy
Neither mass nor energy crosses the boundaries of the system
Mass does not cross boundaries of the system, though energy may do so

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