47 Which of the following materials have NOT been used as cables for suspension bridges?
(A) Iron.
(B) Wood.
(C) Steel.
(D) Vines.

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統計： A(55), B(538), C(64), D(119), E(0) #1484760

詳解 (共 1 筆)

#2312958
(A) Iron        鐵(B)...
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