一般人眼的模糊阈值是A．0.2nmB．0.2μmC．0.2mmD．0.2cmE．0.2km

作者: rantiku 人气: - 评论: 0

问题一般人眼的模糊阈值是

选项 A．0.2nm B．0.2μm C．0.2mm D．0.2cm E．0.2km

答案 C

解析：国际放射学界公认：当半影模糊值小于0.2mm时，人眼观察影像毫无模糊之感；当半影模糊值一0.2mm时，人眼观察影像开始有模糊之感。故0.2mm的半影模糊值就是模糊的阈值。

分享到：

猜你喜欢

发表评论

更多 网友评论 （0 条评论）

暂无评论

错误啦！

消息: [程序异常] : MISCONF Redis is configured to save RDB snapshots, but it's currently unable to persist to disk. Commands that may modify the data set are disabled, because this instance is configured to report errors during writes if RDB snapshotting fails (stop-writes-on-bgsave-error option). Please check the Redis logs for details about the RDB error.
文件: /twcms/kongphp/cache/cache_redis.class.php
位置: 第 85 行

<?php echo 'KongPHP, Road to Jane.'; ?>