concrete. In the winter, ECC can be heated by passing an electric current through it, thereby preventing ice buildup. The cost of the electricity needed is substantially lower than the cost of the de-icing salt we currently use.
Taxpayer: But construction costs for ECC are much higher than for standard concrete, so your proposal is probably
not justifiable on economic grounds.
Which of the following, if true, could best be used to support the highway official’s proposal in the face of taxpayer’s objection?
A. The use of de-icing salt causes corrosion of the reinforcing steel in concrete bridge decks and damage to the concrete itself, thereby considerably shortening the useful life of concrete bridges.
B. Severe icing conditions can cause power outages and slow down the work of emergency crews trying to get power restored.
C. In weather conditions conducive to icing, ice generally forms on the concrete surfaces of bridges well before it forms on parts
of the roadway that go over solid ground.
D. Aside from its potential use for de-icing bridges, ECC might also be an effective means of keeping other concrete structures such as parking garages and airport runways ice free.
E. If ECC were to be used for a bridge surface, the electric current would be turned on only at times at which ice was likely to form.
Ans: A
我做題時只刪除了BC 留下ADE
因為Taxpayer說ECC的成本太高 所以我覺得選E就可以解決這個問題 結果錯了...
可以教教我嗎?
