单项选择题

若被检眼所见到的红色视标显著亮于绿色视标，则应该（）.

A.增加正球镜
B.增加负球镜
C.减少负球镜
D.增加正柱镜

<上一题目录下一题>

热门试题

未分类题

听力原文： Alaska is known for its cold snowy weather. For many years, dog sleds were the only means of transportation. Many Alaskans combine fun and hard work in an annual dog sled racE.The trail race is the longest dog sled race in the worlD.It lasts from two to three weeks and covets almost 17 hundred km. The race goes across Alaska from Anchorage to RomE.It follows the trails that were once used by the people who looked for gold in Alaska's wilderness. The race also follows the route of several brave Alaskans who brought medicine from Anchorage to Rome in the winter of 1925. They carried the badly needed medicine through bad storm and helped save many lives. The race from Anchorage to Rome which is held in March is very hard for the drivers and sleigh dogs, Each day the dogs run for about four hours and then rest for four hours. They run day and night, and sometimes travel as much as one hundred and ten km. a day. The drivers must feed and take care of the dogs ax race periods. Sometimes they only sleep, for about two hours each day. Because the race is so hard, many drivers do not expect to win. For most of them just being able to finish is a victory.(30)A.Winter in AlaskA.B.The brave Alaskan peoplE.C.Alaskan transportation today.D.A dog sled racE.

A.(30)
A.Winter
B.
B.The
C.
C.Alaskan
D.
D.A

单项选择题

若被检眼所见到的红色视标显著亮于绿色视标，则说明（）.

A.远视、近视均过矫
B.远视、近视均欠矫
C.远视过矫、近视欠矫
D.远视欠矫、近视过矫

相关试题