Engineering :: Thermodynamics

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An open system

[A].	Is a specified region where transfers of energy and/or mass take place	[B].	Is a region of constant mass and only energy is allowed to cross the boundaries
[C].	Cannot transfer either energy or mass to or from the surroundings	[D].	Has a mass transfer across its boundaries, and the mass within the system is not necessarily constant
[E].	None of the above

Answer: Option D