問題詳情

47. According to the article, approximately when were steam-powered elevators first developed?
(A) In 1750.
(B) In 1850.
(C) In 1900.
(D) In 1950.

參考答案

答案:A
難度:非常困難0
統計:A(0),B(0),C(0),D(0),E(0)

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