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【简答题】
被称为“伟大的农民画家”的法国19世纪现实主义画家是_____。
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【单选题】一定量的理想气体由平衡态a变到平衡态b。且它们的压强相等Pa=Pb,Va
A.
对外作正功
B.
内能增加
C.
从外界吸热
D.
向外界放热
【简答题】Explain the meaning of the term hybridization . State the type of hybridization shown by the carbon atoms in carbon dioxide, [5 marks] diamond, graphite and the carbonate ion.
【单选题】Diamond and graphite are macromolecules.which statement about diamond and graphite is not correct?
A.
They are giant structures with high melting points.
B.
They are non-conductors of electricity.
C.
They contain only atoms of a non-metal.
D.
They have covalent bonds between the atoms.
【单选题】which statement is correct about diamond,graphite and a C 60 fullerene? I the poorest electrical conductor of the three is diamond IIthe atoms in graphite and C 60 fullerene are sp 2 hybridized IIIthe...
A.
I and II only
B.
I and III only
C.
II and III only
D.
I，II and III
【单选题】In 1985, Rice University researchers Harold Kroto et al. discovered the Buckminsterfullerene (C60), more commonly known as the 'buckyball', which is a molecule resembling a soccer ball in shape and co...
A.
1988
B.
1990
C.
1994
D.
1996
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【单选题】一定量的理想气体由平衡态a变到平衡态b。且它们的压强相等Pa=Pb,Va
A.
对外作正功
B.
内能增加
C.
从外界吸热
D.
向外界放热
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