... nickel mental hydride battery mh-ni蓄电池 radon in underground water 水氡 balloon theodolite 测风经纬仪 ...
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We have discussed some noticeable issues which affect the ratio of Radon in underground water observed by FD-125 Rn instrument.
论述了FD-125测氡仪在水氡观测中值得注意的几个问题：①仪器的供电系统中不应有线路接触不良；
An automatic radon measuring instrument type JSZ-2 for observing the continuous change of radon concentration of underground water in the search of earthquake precursors is described in this paper.
本文描述了一种可用于试验研究地震前兆，观测地下水中氡气浓度连续变化的设备——J SZ - 2型自动测氡仪。
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