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Which of the following is true within an atom according to the passage? [br] An
Which of the following is true within an atom according to the passage? [br] An
游客
2023-07-18
25
管理
问题
Which of the following is true within an atom according to the passage? [br] An electrical cord can be ______.
选项
A、rubber inside and copper outside
B、iron inside and copper outside
C、rubber inside and glass outside
D、copper inside and glass outside
答案
D
解析
本题问“一根电线可以……”。根据electrical cord可定位到文章第二段第六句,文中说电线通常由导体和绝缘体共同组成,电流从电线中心的导体通过,包在导体外面的绝缘体防止电流外泄。前文又提到铁、铜、铝等是良导体,橡胶、木头、玻璃等是绝缘体,故可推出[D]“内部是铜外部是玻璃”正确。[A]“内部是橡胶外部是铜”。由文章可知,橡胶是绝缘体,应在外面,铜是导体,应在内部,所以不正确。[B]“内部是铁外部是铜”。由文章可知,铁是导体,在内部是正确的,铜是导体,也应在内部,所以不正确。[C]“内部是橡胶外部是玻璃”。由文章可知,玻璃是绝缘体,在外面是正确的,但橡胶是绝缘体,应在外面,所以不正确。
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