皮皮学，免费搜题
登录
搜题
【单选题】
Electrical engineers have repeatedly demonstrated that the best solid-state amplifiers are indistinguishable from the best vacuum-tube amplifiers with respect to the characteristics commonly measured in evaluating the quality of an amplifier’s musical reproduction. Therefore, those music lovers who insist that recorded music sounds better when played with the best vacuum-tube amplifier than when played with the best solid-state amplifier must be imagining the difference in quality that they claim to bear. Which one of the following, if true, most seriously weakens the argumentA.
Many people cannot tell from listening to it whether a recording is being played with a very good solid-state amplifier or a very good vacuum-tube amplifier.
B.
The range of variation with respect to the quality of musical reproduction is greater for vacuum-tube amplifiers than for solid-state amplifiers.
C.
Some of the characteristics that are important in determining how music sounds to a listener cannot be measured.
D.
Solid-state amplifiers are more compact, use less power, and generate less heat than vacuum-tube amplifiers that produce a comparable volume of sound.
E.
Some vacuum-tube amplifiers are clearly superior to some solid-state amplifiers with respect to the characteristics commonly measured in the laboratory to evaluate the quality of an amplifier’s musical reproduction.
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】当成年人缺乏维生素B1时，其（ ）。
A.
24小时尿维生素B1排出量少于90μg
B.
每小时夜尿维生素B1排出量少于1μg
C.
或空腹2小时尿维生素B1排出量少于2μg
D.
以上选项均错误
【单选题】坚持以人为本，要求经济社会发展的最终目的应该是（ ）。 A、实现人的全面发展 B、实现经济的可持续发展 C、实现人人自由平等 D、实现人与自然和谐发展
A.
实现人的全面发展
B.
实现经济的可持续发展
C.
实现经济的可持续发展
D.
实现人与自然和谐发展