对以下抗生素描述正确的是

对以下抗生素描述正确的是A.盐酸小檗碱味极苦 B.呋喃妥因含有硝基呋喃及咪唑二酮结构 C.磷霉素是结构最小的抗生素 D.克林霉素分子含有糖环和氯 E.克林霉素是

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[A] An essay.[B] A magazine article,[C] A poem. [D] A short

[A] An essay.[B] A magazine article,[C] A poem. [D] A short story.

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[A] Her professor. [B] A classmate. [C] Her former boss.[D]

[A] Her professor. [B] A classmate. [C] Her former boss.[D] A foreign diplomat.

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如图。在一根长11Cm,外圆周长6Cm的圆柱形柱体外表面,用一根细铁丝缠绕,组成10个螺旋,如果铁丝的两端恰好落在圆柱的

如图。在一根长11Cm,外圆周长6Cm的圆柱形柱体外表面,用一根细铁丝缠绕,组成10个螺旋,如果铁丝的两端恰好落在圆柱的同一条母线上,则铁丝长度的最小值为: A

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