Through the loading test of different displacement amplitude, various loading frequency and circulation, working properties of lead-core rubber damper were investigated.
通过不同位移幅值、不同频率和不同循环的加载试验，研究了铅芯橡胶阻尼器的工作性能。
A method to detect vacuum degree using crystal resonator had been investigated, and resonant frequency of crystal resonator could be stabilized after two days aging test at least.
研究了一种利用晶振测量 真空度的方法，经试验，至少经两天老化后晶振的共振频率才能稳定；
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