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正常情况下，牙龈沟的平均深度为A，<2mmB.0.5－－3.0mmC.3.1－－4.0mmD.4.1－－5.0mmE.>5.1mm

A.0.5--3.0mm
C.3.1--4.0mm
D.4.1--5.0mm
E.>5.1mm

【参考答案】

A

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