听力原文:M: When does the Swedish woman in Room 308 want to be called? W: She's to be called at seven. Q: Where docs this conversation probably take place? (15)
【多选题】A stopped organ pipeof length L has a fundamental frequency of 220 Hz. For which of the following organ pipes will there be a resonance if a tuning fork of frequency 660 Hz is sounded next to the pipe...