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Openai/6970a663-b770-8003-8222-4e276816654c
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===== 2. 冬の日本近海の水温は致命的に低い ===== 冬の沿岸水温の目安: * 太平洋側:10〜15℃ * 日本海側・北部:5〜10℃ この温度帯では、 * ドライスーツなし:数分〜30分で低体温症が重篤化 * ドライスーツ+防寒インナーあり:1〜数時間で低体温症進行 となるのが一般的です(体格・体脂肪・海況・運動量で大きく変動)。
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