单选题:含氟牙膏的氟浓度一般为(  )。

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题目内容:
含氟牙膏的氟浓度一般为(  )。 A.2000ppm
B.1000ppm
C.800ppm
D.1500ppm
E.2500ppm
参考答案:
答案解析:

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