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【单选题】It is hard to track the blue whale, the ocean’’s largest creature, which has almost been killed off by commercial whaling and is now listed as an endangered species. Attaching radio devices to it is d...

A.
the sophisticated technology of focusing sounds under water
B.
the capability of sound to travel at high speed
C.
the unique property of layers of ocean water in transmitting sound
D.
low-frequency sounds traveling across different layers of water

【单选题】如图所示,到医院看病,医生用听诊器听病人心跳的声音是因为(  )

A.
听诊器能使振动的振幅增加,使响度增大
B.
听诊器能改变发声的频率,使音调变高
C.
听诊器能缩短听者与发声体之间的距离,使传入人耳的声音的响度更大些
D.
听诊器能减少声音的分散,使传入人耳的响度更大些

【单选题】医生在诊病时常使用听诊器,听诊器的工作原理是( )。

A.
使心脏振动的振幅增加,响度增大
B.
改变心跳的频率,使音调变调
C.
改变心跳的音色,使声音好听些
D.
减小声音传播过程中的能量损耗
相关题目:
【单选题】It is hard to track the blue whale, the ocean’’s largest creature, which has almost been killed off by commercial whaling and is now listed as an endangered species. Attaching radio devices to it is d...
A.
the sophisticated technology of focusing sounds under water
B.
the capability of sound to travel at high speed
C.
the unique property of layers of ocean water in transmitting sound
D.
low-frequency sounds traveling across different layers of water
【单选题】如图所示,到医院看病,医生用听诊器听病人心跳的声音是因为(  )
A.
听诊器能使振动的振幅增加,使响度增大
B.
听诊器能改变发声的频率,使音调变高
C.
听诊器能缩短听者与发声体之间的距离,使传入人耳的声音的响度更大些
D.
听诊器能减少声音的分散,使传入人耳的响度更大些
【单选题】医生在诊病时常使用听诊器,听诊器的工作原理是( )。
A.
使心脏振动的振幅增加,响度增大
B.
改变心跳的频率,使音调变调
C.
改变心跳的音色,使声音好听些
D.
减小声音传播过程中的能量损耗
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