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【单选题】
下列属于单环β-内酰胺类抗生素的药物是
A.
苯唑西林
B.
舒巴坦
C.
氨曲南
D.
克拉维酸
E.
青霉素G钠
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A.
正确
B.
错误
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【单选题】下列不属于说明表示商品品质方法的是( )。
A.
凭样品买卖
B.
凭等级买卖
C.
凭标准买卖
D.
凭产品名称买卖
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【单选题】拍卖是______。
A.
看货买卖    
B.
凭卖方样品买卖
C.
凭买方样品买卖    
D.
凭对等样品买卖
【单选题】Which of the following statements is NOT true about St. Valentine's Day?
A.
It originated from a legend.
B.
It was named after a priest.
C.
It was first to commemorate death of one's beloved.
D.
It used to have a seamy side.
【单选题】设二叉树只有度为0和2的结点,其结点个数是15,则该二叉树最大深度为( )。【北京理工大学2007一、8(1分)】
A.
4
B.
5
C.
8
D.
9
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