【单选题】【消耗次数：1】
黄酮类化合物的酸性是因为其分子结构中含有
①
糖
②
羰基
③
酚羟基
④
氧原子
⑤
双键
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相关题目
【多选题】
关于黄酮类化合物的理化性质，下列说法正确的是
①
黄酮类化合物都溶于水
②
黄酮类化合物因其结构不同，溶解度差异大
③
黄酮苷一般易溶于水、乙醇、甲醇
④
黄酮苷一般易溶于石油醚、氯仿等有机溶剂
⑤
游离苷元易溶于水
【简答题】
黄酮类化合物常用提取方法有[填空1]法，[填空2]法。
【简答题】
黄酮类化合物常用提取方法有[填空1]法，[填空2]法。
【简答题】
黄酮类化合物所显颜色与分子中是否存在[填空1]及[填空2]的数目和位置有关。
【简答题】
黄酮类化合物所显颜色与分子中是否存在[填空1]及[填空2]的数目和位置有关。
随机题目
【单选题】
There were two small rooms in the house, _______ served as a bathroom.
①
the smallest of which
②
the smallest of them
③
the smaller of which
④
smallest of that
【单选题】
The young people are _____ of their responsibility toward society.
①
consistent
②
conscious
③
sensitive
④
sensual
【单选题】
Did the medicine make you feel better?No. The more _______, _______ I feel.
①
medicine I take; and the worse
②
medicine I take; the worse
③
I take medicine; the worse
④
I take medicine; worse
【单选题】
I often ______ the cooking for my family, but recently I have been too busy to do it.
①
will do
②
do
③
am doing
④
had done
【单选题】
The plane was about to _________, and yet l left my ticket behind.
①
take on
②
take off
③
take up
④
take in
【单选题】
Global warming threatens the _______ of the whole human race.
①
summit
②
superiority
③
survival
④
status
【单选题】
So little ____ with each other that the neighbors could not settle their difference.
①
agreed did they
②
did they agree
③
they agree
④
they did agree
【单选题】
Putting in a new window will _____ cutting away part of the roof.
①
include
②
involve
③
contain
④
comprise
【判断题】
判断线上的内容是否正确：It is generally considered unwise to give a child ____whatever____ he or she wants.
①
正确
②
错误