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【单选题】
红霉素碳酸乙酯 下列药物的性质符合上述哪一条A.
一种广谱抗生素，是控制伤寒.斑疹伤寒疾病的首选药
B.
一种天然抗生素，对酸不稳定，不可口服
C.
一种半合成抗生素，基本合成原料是D-苯甘氨酸和7-ADCA
D.
一种红霉素衍生物，为其5-位氨基糖的2〃氧原子酯的衍生物
E.
一种Β-内酰胺酶抑制剂
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举一反三
【简答题】它的外轮廓的基本形体按其最概括的形式来分有:
【简答题】课程实施的影响因素有以下几点：______________、主体、对象、管理、环境、理论基础。
【简答题】Gratitude is not only an art performed in daily life , but also part of our traditional virtue.Has your mother or friend told you that you ' re an ungrateful person? Do you feel unable to appreciate t...
【简答题】Read the following paragraph and find ou where the topic sentence is. if it is implied, please summarize it yourself. In 1999 you will sleep later because your job will start later in the morning. Too...
【单选题】听力原文：W: Do you go to work by bike every day? M: Occasionally. And I also ride subway or bus sometimes. But I generally walk to work unless it rains. Q: How does the man go to work when the weather is ...
A.
By bus.
B.
By bike.
C.
By subway.
D.
On foot.
【简答题】When you work on computer, the microbes________.A. just stay on our hands B. also stay on the keyboardC. will do harm to youD. will disappear
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