龋齿发生的四联因素不包括(  )。

龋齿发生的四联因素不包括(  )。 A.致龋细菌 B.糖类食物 C.酸性食物 D.宿主 E.时间

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It can be concluded that many of London’s dockyards are____

It can be concluded that many of London’s dockyards are__________A.not used B.

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阅读材料,回答题。In what now seems like the prehistoric times of co

阅读材料,回答题。In what now seems like the prehistoric times of computer history, the

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It was a fact that Lincoln’s speech was__________

It was a fact that Lincoln’s speech was__________A.an immediately success B.wa

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小儿上呼吸道感染常见病原体是(  )。

小儿上呼吸道感染常见病原体是(  )。 A.肺炎球菌 B.金黄色葡萄球菌 C.人肺炎支原体 D.病毒 E.真菌

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