使用相位法测波长时 应将示波器时间旋钮打在什么档位? When using phase method to measure wave
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使用相位法测波长时,应将示波器时间旋钮打在什么档位? When using phase method to measure wavelength, which gear should the oscilloscope time knob set?
A.X-Y档 X-Y gear
B.任意位置 Any position
C.用不到时间旋钮 The time knob is not available
D.可以清楚显示两信号的适当位置 The proper position of the two signals can be clearly displayed

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X-Y档 X-Y gear
