The existence of carbonyl group in structure seems to be a factor that favors the formation of quasi-molecular ion (QMI) or other adduct molecular ion (OAMI) in positive mode.

化合物结构中羰基的存在似有利于化合物在正离子模式下形成准分子离子或其它分子加和离子。

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Since the market is currently in a corrective mode, sector or industry group selection is likely to be a very important factor in putting together a buy list for when the current market decline is over.

FORBES: 4 Industry Groups Beating the S&P 500