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【多选题】
关于 左氧氟沙星 的理化性质下列说法正确的是( )A.
分子结构中有 两 个手性中心，本品左旋 L 构型
B.
属两性物质
C.
易形成鳌合物
D.
分子结构中有一个手性中心，本品左旋 L 构型
E.
光照下不稳定
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举一反三
【简答题】新生儿每分钟心跳次数为
【单选题】An orator, whose purpose is to persuade men, must speak the things they wish to hear, an orator, whose purpose is to move men, must also avoid disturbing the emotional effect by any obtrusion of intel...
A.
should announce his dissent
B.
should be willing to be persecuted by others
C.
should assent to the accepted view to achieve harmony
D.
must be sincere
【单选题】SECTION A CONVERSATIONS Directions: In this section you will hear several conversations. Listen to the conversations carefully and then answer the questions that follow. 听力原文：M: Hello. W: Hello, this ...
A.
invite him to take part in the theatre group
B.
invite him to watch their rehearsal
C.
ask for his help
D.
ask for his opinion about their theatre group.
【简答题】如图所示包装机送纸机构,计算机构自由度,并确定机构是否具有确定的运动。要求写出计算公式,若机构存在复合铰链、局部自由度以及虚约束,则需指出其在图上对应的位置。
【单选题】听力原文： The human brain processes male and female voices differently, according to a recent study, which explains why most of us hear female voices more clearly. The study also explains how we form. men...
A.
Because their voices are more pleasant to listen to.
B.
Because the possessing of voices in the brain is different.
C.
Because listening to women requires more brain activities.
D.
Because women's voices are full of melodies.
【简答题】求图示包装送纸机构的自由度
【单选题】听力原文： The human brain processes male and female voices differently, according to a recent study, which explains why most of us hear female voices more clearly. The study also explains how we form. men...
A.
Because their voices are more pleasant to listen to.
B.
Because the place possessing voices in the brain is different.
C.
Because listening to women requires more brain activities.
D.
Because women's voices are full of melodies.
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