... 等级电阻 class resistance 低频功率测量 low-frequency power measurement 地（球）外噪声 extraterrestrial noise ...
双语例句
1
Because it is related to the magnitude of noise RMS voltage, the frequency characteristic of circuit and the power spectrum of noise source, the accuracy of measurement is quite low.
但由于与噪声电压的大小，网络频率特性及噪声源功率谱形式有关，故测量准确度较低。
2
The AD7788/AD7789 are low-power, complete analog front ends for lowfrequencymeasurement applications.