If $\Delta Q$ and $\Delta W$ represent the heat supplied to the system and the work done on the system respectively,then the first law of thermodynamics can be written as
- A$\Delta Q = \Delta U + \Delta W$
- B$\Delta Q = \Delta U - \Delta W$
- C$\Delta Q = \Delta W - \Delta U$
- D$\Delta Q = -\Delta W - \Delta U$
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