【題目】飛機(jī)失事率小,生還率高。201438馬航MH370終結(jié)于印度洋,無人幸存。200321美國(guó)哥倫比亞號(hào)航天飛機(jī)失事,有關(guān)專家分析認(rèn)為,其原因可能是航天飛機(jī)外部的石墨在空中脫落,擊中機(jī)翼。航天飛機(jī)表面覆蓋石墨可以起隔熱和保護(hù)作用,這主要是因?yàn)槭?/span>( )。

A.能導(dǎo)電

B.密度小

C.熔點(diǎn)高、耐高溫、化學(xué)性質(zhì)穩(wěn)定

D.硬度小,有潤(rùn)滑作用

【答案】C

【解析】

試題分析:石墨可以起隔熱和保護(hù)作用,說明其具有熔點(diǎn)高、耐高溫、化學(xué)性質(zhì)穩(wěn)定的性質(zhì)

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