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【单选题】在检测装配好的渐变焦眼镜时,在焦度计上放置眼镜一定要让镜架的( )向内同时保持眼镜的两镜圈紧靠焦度计上的基准板。
A.
上缘
B.
下缘
C.
都可以
D.
根据渐变焦的品种来选择上缘和下缘
【单选题】Cyber crime, the illegal activity committed on the Internet, is the fastest growing criminal activity in the world and is of major concern to the Government. From traditional online crime to new crime...
A.
the unlawful activities committed by the Internet
B.
the illegal activities done by telephoning
C.
the unlawful activities done by getting others" digital records
D.
the illegal activities committed by hacking others" computers
【单选题】用渐变焦眼镜测量测量单眼配镜高度的的方法为：还原标记的的镜架置于渐变焦眼镜测量卡上，使镜片上标记的（）对准“0”刻度线，则镜架下内侧缘所对的刻度值即为被检者的瞳高值。 ()
A.
水平中心线
B.
垂直中心线
C.
水平线
D.
垂直线