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【单选题】

王护士在为患者测血压,松开气门使汞柱缓慢下降,当在听诊器中听到第一声博动音时,袖带内的压力

A.
大于心脏收缩压
B.
小于心脏收缩压
C.
等于心脏收缩压
D.
等于心脏舒张压
E.
小于心脏舒张压
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题目标签:气门听诊器下降
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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】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