例句與造句

1. The reference pressure is set by International agreement to be 20 micropascals for airborne sound.
2. Human ear drums are sensitive to variations in the sound pressure, and can detect pressure changes from as small as a few micropascals to greater than For this reason, atm ).
3. Data acquisition in one-third-octave bands is required, followed by processing to yield a logarithmically-scaled value in decibels relative to a sound pressure of 20 micropascals, approximately the threshold of hearing.
4. Both of these sources recommend reporting decibels with an explicit listing of the reference effective pressure, like so : " 74 dB re 20 micropascals ", where the number and units following re is the reference effective pressure.
5. The measure is often stated in dB ( A ), which is the equivalent loudness of the noise on a decibel scale frequency-weighted for how the ear hears, for example : " 15 dBA SPL " ( SPL means sound pressure level relative to 20 micropascals ).
6. It's difficult to find micropascals in a sentence. 用micropascals造句挺難的
7. Sound pressure level : ( 1 ) Ten times the logarithm to the base ten of the ratio of the time-mean-square pressure of a sound, in a stated frequency band, to the square of the reference sound pressure in gases of 20 micropascals ( 礟a ).
8. I think that the shorthand way that this may commonly be done ( and which the writing guideline above warns against and the ANSI standard contradicts ) would be to say, " We recorded a 74 dB SPL at 10 meters from the sound source, " rather than, " We recorded a sound pressure level of 74 dB at 10 meters from the sound source, " or the complete, " We recorded a sound pressure level of 74 decibels re 20 micropascals at 10 meters from the sound source, " which is unambiguous.