【单选题】At each step along the way, economic pessimists warned that the economy was about to tumble into a yawning ______ .
【单选题】碳原子数相同的饱和一元醛、酮是同分异构体,通式为 ?
【简答题】相同碳原子数的饱和一元醛、酮互为(),通式为()
【单选题】At each step along the way, economic pessimists warned that the economy was about ____ tumble into a yawning chasm.
【判断题】企业当月新增的固定资产,当月不计提折旧,自下月起计提折旧,当月减少的固定资产,当月仍计提折旧。
【判断题】稳定性指油脂抗酸败变质的能力。饱和程度越高,其稳定性越好。