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【单选题】
用听诊器开始在孕妇腹壁听到胎心音的孕周是
A.
8~10周
B.
12~16周
C.
16~20周
D.
24~28周
E.
32~34周
题目标签：听诊器
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【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
【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
【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.
减少声音传播过程中的能量损耗
【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 enered 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】医生用听诊器诊病是因为( )。
A.
听诊器能使振动的振幅增加，使响度增大
B.
听诊器能改变发声体的频率，使音调变高
C.
听诊器能缩短听者距发声体间的距离，使传入人耳的响度更大些
D.
听诊器能减少声音分散，使传入人耳的响度更大些
【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 enered species. Attaching radio devices to it is d...
A.
to trace and locate enemy vessels
B.
to monitor deep-sea volcanic eruptions
C.
to study the movement of ocean currents
D.
to replace the global radio communications network
【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
【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 enered species. Attaching radio devices to it is d...
A.
It is now partly accessible to civilian scientists.
B.
It has been replaced by a more advanced system.
C.
It became useless to the military after the cold war.
D.
It is indispensable in protecting enered species.
【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 enered 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
相关题目：
【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
【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
【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.
减少声音传播过程中的能量损耗
【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 enered 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】医生用听诊器诊病是因为( )。
A.
听诊器能使振动的振幅增加，使响度增大
B.
听诊器能改变发声体的频率，使音调变高
C.
听诊器能缩短听者距发声体间的距离，使传入人耳的响度更大些
D.
听诊器能减少声音分散，使传入人耳的响度更大些
【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 enered species. Attaching radio devices to it is d...
A.
to trace and locate enemy vessels
B.
to monitor deep-sea volcanic eruptions
C.
to study the movement of ocean currents
D.
to replace the global radio communications network
【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
【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 enered species. Attaching radio devices to it is d...
A.
It is now partly accessible to civilian scientists.
B.
It has been replaced by a more advanced system.
C.
It became useless to the military after the cold war.
D.
It is indispensable in protecting enered species.
【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 enered 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
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