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【单选题】
示波器是一种显示仪器。你可以用它来研究电信号 ( 例如交流电 流和电压 ) 的波形。它也可用来测量电压、电流、功率和频率 ; 实际上,它几乎可以测量涉及到振幅和波形的任何一种量。A.
Oscilloscope is a display instrument. With it you can study the wave-form of an electric signal, such as the wave form of alternating current and voltage. You can measure voltage current, power, and frequency as well; in fact, almost any quantity that involves amplitude and waveform.
B.
Oscilloscope is a display instrument. With it you can study the wave-form of an electric signal, such as the wave form of alternating current and voltage. The heart of the oscilloscope is the cathode-ray tube (CRT).
C.
Oscilloscope is a display instrument. With it you can study the wave-form of an electric signal, such as the wave form of alternating current and voltage. You can measure voltage current, power, and frequency as well. The electron gun consists of a cathode , a control grid, an anode and two sets of deflection plates.
D.
Oscilloscope is a display instrument. With it you can study the wave-form of an electric signal, such as the wave form of alternating current and voltage. You can measure voltage current, power, and frequency as well; in fact, The heart of the oscilloscope is the cathode-ray tube (CRT). This consists of the base, neck ( an electron gun is included), bulb and the face -plate (screen).
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