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单项选择题
A.频率0.66~1Hz,波宽0.1~0.5ms
B.频率1~100Hz,波宽0.1~1ms
C.频率0.66~1Hz,波宽0.01~0.2ms
D.频率0.66~1Hz,波宽0.1~1ms
E.频率2~160Hz,波宽0.1~1ms
单项选择题
A.全长2.5~3.5cm
B.由外耳道口直行至鼓膜
C.外耳道的外1/3为软骨部,内2/3为骨部,外面被覆皮肤
D.软骨部皮肤富有皮脂腺和耵聍腺
E.软骨部皮肤皮下组织少