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【多选题】
回油孔喷油泵当采用升降套筒法调节供油定时时,下述错误的变化是( )。A.
柱塞有效行程Se不变，供油规律不变
B.
Se不变，供油规律变化
C.
Se改变，供油规律不变
D.
Se改变，供油规律改变
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反馈参考答案：
举一反三
【单选题】In the last paragraph, the author tries to justify his conclusion by
A.
reducing to absurdity.
B.
an comparison.
C.
giving an example.
D.
explaining a phenomenon.
【单选题】In the passage, the author tries to tell us purely entertainment programs similar to the classic 'Bewitched'______.
A.
are as good as those in the U.S.
B.
have been seen on many government-controlled networks
C.
are as gray and dismal as the uninformed might unnecessarily visualize
D.
are not as gloomy as the uninformed might unnecessarily visualize
【简答题】黄酮类化合物常用提取方法有（）法，（）法。用溶剂提取法提取黄酮类化合物，若原料为叶或种子时，可用石油醚处理除去（），（），（）等脂溶性杂质。也可在浓缩的提取液中加多倍量的浓醇，除去（），（）等水溶性杂质。
【简答题】By asking these fundamental questions, the author tries to persuade us to change our view on ________.
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