摘要
环状(46)B.Please look at the circle on the right.试验(47)B.With this lens the letters will be blurred. (48)B.Tell me which is clearer. (Position)one,or(position)two? (49)B.Then,this is position one and this is positi-
出处
《中国眼镜科技杂志》
2004年第7期88-89,共2页
CHINA GLASSES SCIENCE-TECHNOLOGY MAGAZINE
