【简答题】【消耗次数：1】
黄酮类化合物的基本母核是[填空1]。现泛指两个苯环(A与B环)，通过[填空2]相互联结，具有[填空3]基本骨架的一系列化合物
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相关题目
【简答题】
黄酮类化合物的基本母核是[填空1]。现泛指两个苯环(A与B环)，通过[填空2]相互联结，具有[填空3]基本骨架的一系列化合物
【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。
【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
随机题目
【单选题】
“I love you” is never a touch on lightly; its the signal ______ a romantic relationship is serious,or an indication of closeness between parents and children.
①
that
②
why
③
when
④
whether
【单选题】
“ Has he seen this film ? ” “Yes. He______ it several days ago.”
①
saw
②
has seen
③
had seen
④
was seeing
【单选题】
The thought flashed across my mind: “By some ?means or______ she has some information about my engagement. But how?”
①
other
②
others
③
the other
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the others
【单选题】
You cant imagine what great trouble they have________the problem________.
①
to solve;being talked about
②
solving;discussing
③
to solve;to talk about
④
solving;being discussed
【单选题】
When I saw Mary , she _______on the piano.
①
is playing
②
plays
③
was playing
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played
【单选题】
It may only be through repeated experiments _______ a baby will come to accept the idea _______ other people can have different views from what he or she has.
①
how;which
②
how;that
③
that;that
④
which;which
【单选题】
This technology has been ?around for a long time, but not until recent years _______ it in marketing.
①
businesses employed
②
did businesses employ
③
businesses had employed?
④
had businesses employed