The steel sample is molten by radio freguency induction heating in pure nitrogen flow.
试样在高纯氮气流中用高频感应加热熔融。
2
We have discovered that the signal freguency receivered driffes off and small in making up the receiver of 882F freguency modulation.
在882F调频接收机组装过程中发现，调频接收频率偏小。
3
Treating a bowl of centrifuge as a clamped-free thin-walled cylinder, fromulas to calculate natural freguency are given by using Rayleigh's energy method.