Thimas Edison那篇 最後一段說道:
..."This machine," he wrote in 1878, shortly after the clamor surrounding the invention had died down, "can only be built on the American principle of interchangeability of parks, like a sweing machine."...
110. Thomas Edison compared the phonograph to the sewing machine in terms of its
(a)varuety of uses
(b)cost of manufacture
(c)future impact on business
(d)method of production
答案是(d) 不懂為什麼..可以為我解釋一下嗎?
謝謝