polyoxymethylene
Third-person singular simple present indicative form of reask
(physics) A unit of energy equal to one billionth of an electronvolt, symbol neV
(physics) A solid that has the same electronic or crystal structure as another
(chemistry) A polymer of formaldehyde having a repeat unit of -CH₂-O- ; it is used in engineering to make small gears etc
エンジニアは歯車にホルムアルデヒドの重合体(繰り返し単位:-CH2-O-)を選んだ。摩擦が少なく寸法安定性が高いため、摩耗が減るからだ。
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