Question 1 of 40
Walking Character
2%
Princess Right

ほとんどの住宅所有者は、専門業者によるHVAC（暖房・冷房）のチューンアップをどのくらいの頻度で依頼すべきですか？

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A 5年に1回
B 年1〜2回
C 故障した時のみ
D 毎月
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