题目内容
(请给出正确答案)
[单选题]
关于简谐均匀扩张球面波的声能流密度和声强,下面说法正确的是()。
A.声能流密度是随着空间和时间变化的
B.既有正向声能流,也有反向声能流
C.声强随着传播距离的一次方衰减
D.声强随着传播距离的平方衰减
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A.声能流密度是随着空间和时间变化的
B.既有正向声能流,也有反向声能流
C.声强随着传播距离的一次方衰减
D.声强随着传播距离的平方衰减
第3题
A、Taj Mahal is located in Mumbai.
B、Jaipur is also known as the Pink City of India.
C、It's in Red Fort where the Indian Declaration of Independence was made.
D、Bangalore is known as the "Silicon Valley" of India.
E、Taj Mahal is located in Agra.
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