2. 外语
  3. The flow of an electric current in a regular conductor is made possible by the fact that______. The best advantage of new ceram

The flow of an electric current in a regular conductor is made possible by the fact that______. The best advantage of new ceram

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问题 The flow of an electric current in a regular conductor is made possible by the fact that______.
The best advantage of new ceramic materials over metal superconductors is ______.
选项 A、their inexpensive cost
B、their more practical uses
C、their better quality in conductivity
D、their nature for multi-application
答案A
解析 见文章第五段的首句，原文为“新型的陶瓷材料可用相对便宜的液氮来保持超导，相比之下，金属超导需要温度更低、价格昂贵的液氦来维持”，与选项A含义相符。
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