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单词 photoemissive tube photometer
释义 photoemissive tube photometer
[¦fōd·ō·i`mis·iv ¦tüb fǝ`täm·ǝd·ǝr]
ENGINEERING
A photometer which uses a tube made of a photoemissive material; it is highly accurate, but requires electronic amplification, and is used mainly in laboratories.
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