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单选题
What physical characteristic does a retinal scan biometric device measure?视网膜扫描设备检测哪些人体物理特性？（）
A
The pattern of light receptors at the back of the eye眼底光受体组织的图案
B
The pattern of blood vessels at the back of the eye眼底血管的图案
C
The amount of light reaching the retina视网膜受光量
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单选题What physical characteristic does a retinal scan biometric device measure?视网膜扫描设备检测哪些人体物理特性？（）A
The pattern of light receptors at the back of the eye眼底光受体组织的图案B
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The amount of light reaching the retina视网膜受光量
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