皮皮学，免费搜题
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【简答题】
交响乐是由管弦乐队演奏的大型乐曲，弦乐器的琴弦由于______发出了声音：乐队指挥员能够分辨出交响乐中各种乐器发出的声音，他是根据声音的______进行辨别的．夜深人静的时候，如果把播放器的音量开得过大，优美的音乐声此时也变成了______．
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】以下对于吗啡的化学结构特征阐述错误的是
A.
含有叔胺基团，所以显碱性
B.
含有氧桥键，所以很稳定
C.
含有酚羟基，所以显酸性
D.
7,8位含有双键，所以可以被还原
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