含氟牙膏的氟浓度一般为A.800ppm B.1000ppm C.1500pp

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问题 含氟牙膏的氟浓度一般为A.800ppmB.1000ppmC.1500ppmD.2000ppmE.2500ppm

选项 A.800ppm
B.1000ppm
C.1500ppm
D.2000ppm
E.2500ppm

答案 B

解析
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