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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