单项选择题X 纠错
A.the optical unit must be positioned so that the sun does not shine into the aperture.光学设备必须被定位以便使太阳照进光圈
B.there is are latively high rate of false accepts.有一个相对较高的错误接受率。
C.the iris pattern changes as a person grows older.虹膜图案随着一个人年龄的增长而变化。
D.concern that the laser beam may cause eye damage.关注激光束可能会导致眼睛损伤。
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