In 2001, 273 cities conductednoise monitoring on the road traffic, with 59 ones over the previous year.
2001年，273个城市进行了道路交通噪声监测，比上年增加了59个城市。
2
It is difficult to design and build an effective power line EMI filter for switched mode power supply without distinguishing the differential or common mode component from conductednoise.
诊断开关电源传导干扰的主要性质，分别测量共模干扰和差模干扰，是正确设计电源EMI滤波器的第一步。
3
The white noise scanning test was conducted before the shaking table test and repeated at every interval of each test to obtain the law of the basic frequency vary with the time.