Question 1 of 40
Walking Character
2%
Princess Right

DOT規格に適合したオートバイ用ヘルメットの主な目的は何ですか？

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A 風切り音を低減するため
B 事故時に頭部と脳を保護するため
C 空力性能を向上させるため
D 通信システムを保持するため
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