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【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
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举一反三
【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】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】In department stores and closets all over the world, they are waiting. Their outward appearance seems rather appealing because they come in a variety of styles, textures, and colors. But they are ulti...
A.
The multi-functional use of high heels.
B.
Their attempt to show off their status.
C.
The rich variety of high heel styles.
D.
Their wish to improve their appearance.
【单选题】刘女士，65岁，退休干部，平日缺乏体育锻炼，口味偏咸，身高155cm, 体重70kg,确诊高血压，肾功能不良。医生建议其増加运动，下列不适合刘女士身体活动 的是：()。
A.
举重
B.
太极拳
C.
步行
D.
'游泳
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】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】In department stores and closets all over the world, they are waiting. Their outward appearance seems rather appealing because they come in a variety of styles, textures, and colors. But they are ulti...
A.
The multi-functional use of high heels.
B.
Their attempt to show off their status.
C.
The rich variety of high heel styles.
D.
Their wish to improve their appearance.
【单选题】刘女士，65岁，退休干部，平日缺乏体育锻炼，口味偏咸，身高155cm, 体重70kg,确诊高血压，肾功能不良。医生建议其増加运动，下列不适合刘女士身体活动 的是：()。
A.
举重
B.
太极拳
C.
步行
D.
'游泳
参考解析：
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