一般的刷牙方法能清除菌斑的百分率为 ( )A.65% B.75% C.85% D.70% E.80%

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问题一般的刷牙方法能清除菌斑的百分率为 ( )

选项 A.65%
B.75%
C.85%
D.70%
E.80%

答案B

解析

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