一人将眼睛紧靠焦距为15cm的放大镜去观察邮票,看到邮票的像在30cm远处。试问:邮票离透镜多远?
A. 紧靠透镜
B. 10cm
C. 23cm
D. 30cm
查看答案
正常视力的人,其远点在无穷远处,近点距离约为 10~12cm,远视眼就是近点变近,近视眼远点变远。
A. 对
B. 错
从物体上两点射入到眼睛节点的光线所夹的角称为视角。通常用眼睛能分辩的最小视角的倒数来表示眼睛的分辨本领，称为视力.
A. 对
B. 错
善于学习语言的人能够把他们的错误变成通向成功的一大步。
A. People who good at learning Language can turn their mistakes into a big step on success.
B. Good language learners can turn their mistakes into a big step toward their success.
C. Welllanguage learners can turn their mistakes into a big step toward their success.
D. People who good at language can turn their mistakes into a big step toward their success.
这次事故给了他一个教训，从那以后他再也不会酒后驾车了。
A. The accident taught him a lesson, and from then on, he would never drive a car after drink.
B. The accident taught he a lesson, and from then on, he will never drive a car after drink.
C. The accident taught him a lesson, and from then on, he would never drive a car after drinking.
D. The accident taught he a lesson, and from then on, he would never no longer drive a car after drinking.
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