Three types of ion gauges with tube electron multiplier are developed. It intends to solve the low pressure measurements up to 10~ (-14) torr.
研制成功了三种结构的具有管型电子倍增器的电离规,企图解决低到10~(-14)托的压强测量问题。
Combining with the toxicology experiment of snails ( a kind of zoobenthos) and applying the average lethal dose method and graphic method, the paper calculates the half lethal dose of mercury to snails.
结合底栖动物螺蛳的毒理学实验,采用平均致死量法与图解法,计算获得螺蛳对重金属Hg的半数致死剂量。
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