电压u=220sin(314t-π/4)V的初相角为()A、314t-π/4B、-π/8C、-π/4D、π/4
电压u=220sin(314t-π/4)V的初相角为()
- A、314t-π/4
- B、-π/8
- C、-π/4
- D、π/4
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