预防龋病的关键环节是() A.控制菌斑 B.控制糖的摄入 C.氟化物的应用 D.增强

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问题:

预防龋病的关键环节是()

A.控制菌斑

B.控制糖的摄入

C.氟化物的应用

D.增强机体免疫力

E.增强牙的抗龋能力

考点:口腔科住院医师口腔预防口腔预防题库
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Wood-block printing was invented sometime between the 4th and the 7th c 小题1: in Chi­na. The earliest book that we have was p 小题2: in 868 and was found in a Dunhuang cave. Wood-block printing took a long time because a new block was needed for every p小题3: in z book. By the 1 Ith century printed books could be f 小题4:all over China. They included books of Confucius' thoughts, dictionaries, and books on maths. In 1340, books could be printed u-sing two c  小题5: , black and red.

A 小题6: the Chinese learnt about printing so early, printing was not introduced in other parts of the world for hundreds of years. It is thought that when the great Italian traveler Marco Polo visited China in the 13th century, he s 小题7:printed books. It is possible that Marco Po­lo brought that k 小题8: to Europe. But printed books did not come to Europe u 小题9:1450 when a German called Johann Gutenberg i 小题10: a printing machine. Twenty-four years later, in 1474, an Englishman called William Caxton printed the first printed book in English. His second book was about the game of chess. Caxton printed about a hundred books, and some can still be found today in museums.

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锅炉吹灰的顺序是什么?为什么?

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订货、进货需要根据具体品种、具体供应者设定订货进货提前期,这些信息由 ( )提供。

A.社会需求计划

B.供应商资源文件

C.订货进货计划

D.库存文件

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