【名词&注释】
传播速度(propagation velocity)
[多选题]关于声现象下列说法正确的是 【 】
A. 真空不能传声是通过实验与推理的方法获得的
B. 发出较强声音的喇叭能使它前面的烛焰“跳舞”,说明声波能传递能量
C. 课堂上听到老师的讲话声,说明声音可以在空气中传播
D. 声音在不同介质中传播速度相同
查看答案&解析查看所有试题
学习资料:
[单选题]27. According to(根据) the passage, a good breakfast means _______.
A. meat and fish
B. eggs and rice
C. a lot of food
D. the right food
[单选题]Whose guitar is this?
It ________ Alice. She plays the guitar.
A. might be
B. must be
C. can belong
D. might belong to
[单选题]15.
A. uses
B. differences
C. minds
D. mistakes
[单选题]30.
A. mountains
B. cities
C. rivers
D. seas
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