Search stories, writers or societies
Continue ReadingClear All
What Others Are ReadingRefresh
×
Write down what you like about the story
Install this webapp for easier offline reading: tap
and then Add to home screen.
如果妳有背熟,應該知道凹透鏡只會縮小,所以,CD刪了,從AB選。
A:物在兩倍焦距外,像會在另一側的焦距到兩倍焦距間,應該是10~20,而非50,A錯。
B:物在焦距內,像為放大正立虛像且與物同側,B可成立。