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【单选题】
下列黄酮中酸性最强的是A.
5,7-二羟基黄酮
B.
7,4'-二羟基黄酮
C.
5-羟基黄酮
D.
3,7-二羟基黄酮
E.
3-羟基黄酮
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举一反三
【简答题】在上面的创业想法中,对你而言最可能成功的创业想法是什么?
【简答题】Japanese students work very hard but many are unhappy．They feel heavy pressures from their parents to do well in school．Most students are always being told by their parents to study harder so that the...
【简答题】离合器打滑的故障现象是什么?
【判断题】离合器打滑的故障现象是汽车低挡起步时,离合器踏板完全抬起后,汽车不能起步或起步困难;汽车加速行驶时,行驶速度不能随发动机转速的升高而升高,且伴随离合器发热,产生焦味或冒烟等现象。
A.
正确
B.
错误
【简答题】D Japanese students work very hard but many are unhappy．They feel heavy pressures from their parents to do well in school．Most students are always being told by their parents to study harder so that t...
【简答题】Japanese students work very hard but many are very unhappy. They feel great pressure from their parents to do well in school and in college. Most students are always being told by their parents to stu...
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