“focus control”的概念、定义、翻译、参考文献-科学参考

单词	focus control
释义	focus control [`fō·kǝs kǝn´trōl] ^ELECTRONICS A control that adjusts spot size at the screen of a cathode-ray tube to give the sharpest possible image; it may vary the current through a focusing coil or change the position of a permanent magnet. ^OPTICS A device to adjust a lens system to produce a sharp image.
随便看	mine water miniature electron tube miniaturization minicartridge minicell minichromosome minicomputer minidisk minifloppy disk minim minimal brain dysfunction syndrome minimal equation minimal flight path minimal-latency coding minimal polynomial minimal realization minimal recognition length minimal surface natrophilite natural abundance natural aging natural antenna frequency natural arch natural asphalt natural binary coded decimal system

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