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【单选题】
能用于确定黄酮结构中有 7-OH 的方法是A.
甲醇钠
B.
乙酸钠
C.
三氯化铝
D.
锆盐 - 枸橼酸
E.
盐酸 - 镁粉
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皮皮学刷刷变学霸
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【单选题】I saw an old man was standing at the corner, with a hat in his hand,____ handouts（施舍物）
A.
waited for given
B.
waiting for being giving
C.
waited to be given
D.
waiting to be given
【单选题】Tom found a bridge ______ the river, and a man was standing on it.
A.
on
B.
over
C.
under
D.
in
【简答题】It was New Year’s Night. An aged man was standing at a window. He raised his mournful eyes towards the deep blue sky, where the stars were floating like white lilies on the suce of a clear calm lak...
相关题目：
【单选题】Tom found a bridge ______ the river, and a man was standing on it.
A.
on
B.
over
C.
under
D.
in