具有化积消疳作用的穴位是
A. 肾纹
B. 四横纹
C. 小横纹
D. 掌小横纹
Using a multimeter, you can measure the peak-to-peak amplitude of the electrical signal.
A. 对
B. 错
The minus sign appears in the voltage gain because the output signal amplitude become smaller compared with the input.
A. 对
B. 错