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1.a tube containing a convex achromatic lens at one end and a slit at the other with the slit at the focus of the lens; light rays leave the slit as a parallel beam.
一端包含一个凸起的消色差透镜另一端在镜头的中心有一个小切口的小管；光线通过小切口成为平行光线。收藏指正
2.Results Routine clinical otological examination found high rate of otopiesis (86.36%) with a 61.36% of the pharyngeal arifice of eustachian tube presenting as a slit. Palatognathus hypoacusis reached 93.18% in pure-tone audiometry. Abnormal tympanagram consisted of 95.45% with a 47.73% positive auditory reflex rae.
结果　纯音测听听力减退为 93.18% ,声导抗测试异常的鼓室功能曲线占 95 .45 % ,声反射引出率为 47.73% ,听脑干反应测试 ,5 4.5 5 %受试耳的听阈高于正常值 ,I波潜伏期与正常值间有显著性差异 ,鼓膜内陷为 86 .36 % ,咽鼓管咽口呈线型改变达 6 1.36 %。收藏指正
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