... 向上通风炉 up-draft furnace 垂直式检流计 upright galvanometer 尿素计 ureameter; ureometer ...
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A bearing galvanometer is modified using a differential amplifier. It has the advantage of high sensitivity and is less likely to damage and able to be put upright.
用差动放大器对轴承式检流计进行改造，使之具有灵敏度高、不易损坏、可直立放置等优点。
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