A:声音产生的原因
B:声音传播的条件
C:音调是否与频率有关
D:乐音与噪声的区别
读拼音,写汉字。
píng
jiān
zhè
____
- Who plays the violin ______, Sally or Kylie?
- Sally. But she gave the chance to Kylie.
哨____ ____ 枪____ ____
防____ ____ 削____ ____