我国某出口企业向美国出口机器设备，当美元与人民币的兑换比率为1∶6时，每出口一套价格为12万美元的设备，可获利36万元人民币。当人民币对美元贬值20%，在成本不变的情况下，此时该企业每出口一套设备，获利（  ）

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                           Amount of Electricity Used

This graph show the amount(数量) of electricity used in a small city. It is clear that the city uses more electricity in____  than in ____ . In summer, people use the most electricity at 12 p.m. This is probably ____ the high temperature at noon. In winter, people use the most electricity at____  The graph also shows the amount of electricity used ____ from 6 a.m. to 12 p.m. The amount of electricity use decreases (减少)from 6 p.m. to 12 a.m.