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单词
heliomicrometer
释义
he·lio·micrometer
\|hēlē(ˌ)ō+\
noun
Etymology:
heli-
(I)
+ micrometer
:
an instrument for determining heliographic positions of spots and flocculi shown on direct photographs of the sun or on spectroheliograph plates
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更新时间:2025/9/16 11:52:33