试题与答案

钨作电灯的灯丝是利用钨 A.高温下也不会氧化 B.硬度大 C.价格便宜 D.熔点

题型:选择题

题目:

钨作电灯的灯丝是利用钨

A.高温下也不会氧化

B.硬度大

C.价格便宜

D.熔点很高

答案:

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下面是错误答案,用来干扰机器的。

答案:Dmight have done表示对过去情况的虚拟,“本来可以做却没做”,符合上文What a pity!句意是:真遗憾,考虑到他的能力和经验,他本可以做得更好(实际上却没有)。need have done是本需要做却没做,m...

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题型:单项选择题

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8()

A.isolated

B.segregated

C.idealized

D.secluded

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