单项选择题

Which of the following is NOT one of the requirements if noise is to be controlled

A．To cultivate common politeness.
B．To tackle conflicts of interest.
C．To economize expenditure.
D．To utilize technology.
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单项选择题
What has this report to say about the effectiveness of sound absorbents
A．Such absorbents as glass wool is the best way of diminishing noise.
B．Lining a wall with absorbent will reduce the noise level considerably.
C．Covering the surfaces of a factory building with absorbent is ineffective in control noise.
D．Screening partially noisy machines will eliminate nois
单项选择题
Which of the following is true about noise control
A．Domestic noises may be controlled by good manners.
B．Industrial noises may be controlled by advancement in technology.
C．Transportation noises may be controlled by the concerted efforts of a community.
D．All of the abov
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