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单词 phototube current meter
释义 phototube current meter
[`fōd·ō´tüb `kǝ·rǝnt ´mēd·ǝr]
ENGINEERING
A device for measuring the speed of water currents in which a perforated disk, which rotates with the current by means of a propeller, is placed in the path of a beam of light that is then reflected from a mirror onto a phototube.
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