题目内容

【题目】飞机失事率小，生还率高。2014年3月8日马航MH370“终结”于印度洋，无人幸存。2003年2月1日美国“哥伦比亚”号航天飞机失事，有关专家分析认为，其原因可能是航天飞机外部的石墨在空中脱落，击中机翼。航天飞机表面覆盖石墨可以起隔热和保护作用，这主要是因为石墨( )。

A．能导电

B．密度小

C．熔点高、耐高温、化学性质稳定

D．硬度小，有润滑作用

【答案】C

【解析】

试题分析：石墨可以起隔热和保护作用，说明其具有熔点高、耐高温、化学性质稳定的性质

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