From molecule structure of coal, coal reaction character was described by aromatic ring, hydrogenation aromatic ring, alkane, alkane bond, oxy-group.

从煤分子结构出发，煤的反应性可以用芳香环，氢化芳香环，烷烃链、烷烃键和含氧官能团的变化来描述。

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Among the largest underlying components of VTV, in trading today ConocoPhillips ( NYSE: COP) is off about 0.8%, Occidental Petroleum Corp ( NYSE: OXY) is off about 0.5%, and American International Group Inc ( NYSE: AIG) is lower by about 0.1%.

FORBES: VTV, COP, OXY, AIG: Large Inflows Detected at ETF

Among the largest underlying components of VTI, in trading today Schlumberger Ltd ( NYSE: SLB) is down about 2.8%, Occidental Petroleum Corporation Del ( NYSE: OXY) is down about 1.3%, and Goldman Sachs Group Incorporated ( NYSE: GS) is higher by about 1.5%.

FORBES: Investors Getting More Bullish On Equities -- GS, OXY, SLB In Focus