A:原子要吸收光子,电子的动能增大,原子的电势能增大,原子的能量增大
B:原子要放出光子,电子的动能减小,原子的电势能减小,原子的能量也减小
C:原子要吸收光子,电子的动能增大,原子的电势能减小,原子的能量增大
D:原子要吸收光子,电子的动能减小,原子的电势能增大,原子的能量增大
一个长方形操场,长110米,宽90米。把它画在比例尺是 的图纸上,长画____厘米,宽画____厘米。
根据短文内容和所给的汉语提示,写出短文空白处各单词的正确形式,每空限填一词。Miss White is from France. She can speak two____ (语言). She is a ____ (护士). She works in a ____ (医院)at night. She works very____ (努力). She likes to take a walk in a ____ (安静的) place. She likes ____ (动物) . She often goes to the zoo. Her cousin Bob is a reporter. He’s ____ (拍照)photos at the park . It’s____ (寒冷的) today. Look! Some people are swimming at the____ (泳池). Mr White is____ (感到惊讶的)to see it.
I'm sorry to hear that his grandmother ______two days ago.
They may be able to help childcare so that you can have a break.