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【单选题】
黄酮类化合物的酸性是因为其分子结构中含有A.
糖类
B.
羰基
C.
酚羟基
D.
氧原子
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
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【简答题】黄道坐标系的主要用途是 。
【简答题】Before(ask)___________ for a promotion, try to find out how the decision makers in your company feel about you. 2017.6 2018.12.31
【简答题】(2017.06) 33. Before (ask) __________ for a promotion, try to find out how the decision makers in your company feel about you.A. asking
【单选题】In a sports team each player has a clear role，and there are few occasions members are confused or uncertain of their roles．
A.
which
B.
that
C.
when
D.
how
【简答题】Section B: 33. Before (ask) _ _ for a promotion, try to find out how the decision makers in your company feel about you.
【单选题】下列关于在“快速蒙版选项”对话框中描述错误的是( )。
A.
勾选“被蒙版区域”则选区外会被蒙上半透明的颜色。
B.
勾选“被蒙版区域”则选区会被蒙上半透明的颜色。
C.
勾选“所选区域”则选区会被蒙上半透明的颜色。
D.
“颜色”组是用来设置蒙版的颜色及不透明度的。
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