Continuous exposure to sound above 80 decibels could be harmful.持续暴露在强度高于80分贝的噪声中可能有害。However, psychologists distinguish between'sound " and " noise " .'sound " is measured physically in decibels.然而, 心理学家把声音与噪声...
Continuous exposure to sound above 80 decibels could be harmful.持续暴露在强度高于80分贝的噪声中可能有害。The typical lawn mower makes about 90 decibels of noise.典型的割草机发出的声响约为90分贝.A normal conversation reaches 55 decibels.普通的谈话即可达55分贝....
Breather valve and flame arrestor are indispensable safety devices.可见呼吸阀、阻火器是储罐不要缺少的安全设施.So the railroad will buy the spark arrestor.所以铁路将购买阻火器.The railroad will realize that it can save this $ 100 cost by investing $ 50...
The way a good investor does really well is by engaging in successful futurology.优秀的投资者之所以能够成功是因为他们可以很好地预测未来。Bureaucrats , engaging in trade led to tradespeople's bureaucratization and further caused tradespeople�...
在第6.11节中节中,将讨论柱形空腔问题.In Section 6 . 11 the cylindrical cavity problem is discussed.两心房是由薄壁构成的空腔.Both atria are thinwalled muscular chambers.在很多发动机内, 恒温控制器装在进气岐管或排气岐管的空腔中.In many engines, the thermostat is located in a we...