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(25), B(356), C(35), D(65), E(0) #1514909

詳解 (共 3 筆)

#2493686
A suspension懸吊  brid...
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#3717025
懸索橋是一種使用架空電纜支撐其巷道的橋樑...
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#3728591

One of the oldest engineering forms, suspension bridges were constructed by primitive peoples using thick vines for cables. A much stronger type was introduced in India around 400 A.D. that used cables of braided bamboo. In the early nineteenth century, suspension bridges used iron chains for cables. Today, the cables are made of thousands of individual steel wires bound tightly together. 

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