会話トレ Drill: 電気工学 Electrical engineering, Mathematics
絶縁体
insulator
an insulator
insulation
絶縁
平方根 (へいほうこん hehoukon)
(the) square root
極性 (きょくせい Kyokusei)
polarity
pole =極地
= P
2極=2P
an insulator
insulation
絶縁
= P
2極=2P
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