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单词
Fresnel lens
释义
Fresnel lens
[frā`nel `lenz]
OPTICS
A thin lens constructed with stepped setbacks so as to have the optical properties of a much thicker lens.
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DDT
DDTA
DDVP
DEA
deaccentuator
deacetylation
deacidification
Deacon process
deactivation
deacylation
dead
dead ahead
dead air
dead-air space
dead area
dead arm
dead astern
dead axle
dead band
deadbeat
deadbeat algorithm
deadbeat compass
deadbeat escapement
deadbeat response
dead block
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