問題詳情
【題組】47 What does “Such changes” refer to in the second paragraph?
(A) Having elevator-dedicated emergency power systems.
(B) Improving the software and sensing systems.
(C) Installing waterproof elevator components.
(D) Using remote control operations.
參考答案
答案：B
難度：適中0.584615
統計：A(34),B(114),C(17),D(27),E(0)