唾液pH约在A.6.0~7.9 B.5.0~6.9 C.5.0~7.9 D.6.5~7.5 E.6.0~8.9

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问题 唾液pH约在

选项 A.6.0~7.9
B.5.0~6.9
C.5.0~7.9
D.6.5~7.5
E.6.0~8.9

答案A

解析
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