Using a multimeter, you can measure the peak-to-peak amplitude of the electrical signal.
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The minus sign appears in the voltage gain because the output signal amplitude become smaller compared with the input.
A. 对
B. 错
矿内空气中常见的有害气体有哪些?《煤矿安全规程》规定各类有害气体的最高允许浓度分别是多少?
Excel2010中,当C7单元格中有相对引用=SUM(C3:C6),把它复制到E7单元格后,双击它显示出( )
A. =SUM(C3:C6)
B. =SUM(C4:C7)
C. =SUM(E3:E6)
D. =SUM(E3:E7)