Replace the underlined words with the correct form of the words below:In my opinion, his academic work and his skill in sport are extremely good()
A. barely
B. ignorant
C. impressive
D. intelligent
E. peer
F. sipG.spill
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Replace the underlined words with the correct form of the words below:There was only just enough room for two people()
A. barely
B. ignorant
C. impressive
D. intelligent
E. peer
F. sipG.spill
N2分子中,含有σ键和π键的数目分别是()
A. 2,2
B. 1,2
C. 2,1
D. 1,1
下列物质中不能形成分子间氢键的是()
A. CH4
B. H2O
C. HF
D. NH3
电路中电流、电压的参考方向可以任意指定。指定的参考方向不同,不影响问题的最后结果()