問題詳情
【題組】49. According to the information in the third paragraph, which of the following improvements made it possible to lengthen the tone produced by the piano?
(A)The introduction of pedals
(B)The use of heavy wires
(C)The use of felt-padded hammerheads
(D)The metal frame construction
參考答案
答案：A
難度：非常困難0
統計：A(0),B(0),C(0),D(0),E(0)