题目

The company was named Gates Hall __________a man named James Gates. A.in need of     B.in search of           C.with the help of        D.in memory of 答案:D测量视力时,人距视力表5m。利用平面镜成像特点可以节省空间,如图所示,小明面对镜子背对视力表,检查视力,下面说法正确的是A.视力表在平面镜中的像距视力表3m B.视力表在平面镜中的像距小明5m C.视力表在平面镜中的像距平面镜5m D.小明在平面镜中的像距视力表6m
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