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【判断题】
蜂鸣器它是音响装置中声压级最低、频率也较低的装置。( )
A.
正确
B.
错误
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举报参考答案：
举一反三
【单选题】Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-too-distant future when all autos will be abandoned and allowed to rust. Other authorities, ho...
A.
How to render automobiles pollution-free.
B.
How to make smaller and safer automobiles.
C.
How to solve the problem of traffic jams.
D.
How to develop an automated subway system.
【单选题】声波的声压级L[ P ]应为( )。
A.
声波声压与基准声压之比的20倍
B.
声波声压与基准声压之比的10倍
C.
声波声压与基准声压之比的以10为底的对数的20倍
D.
声波声压与基准声压之比的以10为底的对数的10倍
相关题目：
【单选题】Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-too-distant future when all autos will be abandoned and allowed to rust. Other authorities, ho...
A.
How to render automobiles pollution-free.
B.
How to make smaller and safer automobiles.
C.
How to solve the problem of traffic jams.
D.
How to develop an automated subway system.
【单选题】声波的声压级L[ P ]应为( )。
A.
声波声压与基准声压之比的20倍
B.
声波声压与基准声压之比的10倍
C.
声波声压与基准声压之比的以10为底的对数的20倍
D.
声波声压与基准声压之比的以10为底的对数的10倍
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