関連ワード:  is 3 phase better than single phase    is 3 phase inverter better than single phase    is 3 phase motor better than single phase    is 3 phase more efficient than single phase    is 3 phase more expensive than single phase    is 3 phase more powerful than single phase    is 3 phase air conditioning better than single phase    is 3 phase more dangerous than single phase    is 3 phase cheaper than single phase    is 3 phase or single phase better