NACE CP1 老师也太懒了
下面是第一章的第43个幻灯片，功率定义都没搞利落。一年教多少课程，没看出来？不信。
"•Power is the energy used by an electricaldevice.
•Power is measured in watts.
•Power = P= EI"
"•Power is the energy used by an electricaldevice.
•Power is measured in watts.
•Power = P= EI"
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