单项选择题What can NOT be inferred from the first paragraph
单项选择题Which of the following is NOT one of the requirements if noise is to be controlled
单项选择题What has this report to say about the effectiveness of sound absorbents
单项选择题Which of the following is true about noise control
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