试题与答案

下列属于新事物的是 A.从抽签测字到计算机“科学算命” B.毛孩的出现 C.由猩

题型:选择题

题目:

下列属于新事物的是

A.从抽签测字到计算机“科学算命”

B.毛孩的出现

C.由猩红热到SARS病毒的出现

D.从牛顿力学到相对论

答案:

答案:D

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a mol FeS 与b mol Fe3O4投入到V L c mol·L-1 的硝酸溶液中恰好完全反应,假设只产生NO气体。所得澄清溶液的成分是Fe(NO3)3和H2SO4的混合液,则反应中未被还原的硝酸物质的量(mol)为:①( a + 3b )    ②(3cV-9a-b) /3    ③(9a + b )/3   ④(cV-3a-9b)   ⑤ (3a+9b)则正确的答案是[ ]

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