本文利用描述函数法，重点分析了条件反馈校正对自持振荡的抑制作用。
Using the describing function method, this paper gives emphasis to analyse the conditional feedback correction effect on restrain self-sustaining oscillation.
单手的重点功能，辐射校正，反映背景温度补偿，校正增加和传输，在大多数情况下的测量精度。
One-handed focus capability, emissivity correction, reflected background temperature compensation, and transmission correction increase the accuracy of measurements in most situations.
重点讨论了减振台的结构设计和自动水平校正的机理。
The paper mainly discuss the structural design of vibration reduction table and its self-adjusting mechanism toward horizontal.
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