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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单项选择题

Mr. D. W. Robinson discussed noise both in sociological terms and in terms of energy. What did he mean by this distinction

A．They refer to the objective and subjective nature of the problem respectively.
B．Noise is dispensable in terms of energy but it is indispensable in sociological terms.
C．Noise is hard to control in terms of energy while it may be controllable in sociological terms.
D．All of the abov

单项选择题

Which of the following may be unnecessary in conducting Gallup Poll

A．Sampling the subjects according to different factors.
B．Regulating factors according to circumstances.
C．Interviewing as many people as possible.
D．Using laws of probability to forecast the result.