【已刪除】45. A 50 m bridge is made with segments of concrete. If the linear expansion coefficient is 1.2 × 10-5 °C -1 , how much spacing is needed to allow for expansion during an extreme temperature change of150 °F?
(A) 2.0 cm
(B) 2.5 cm
(C) 3.0 cm
(D) 3.5 cm
(E) 4.0 cm
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