A:①③④⑤⑥⑦
B:①③④⑤⑦
C:①③⑤⑥⑦
D:②③④⑤⑥
某金属在光的照射下产生光电效应,其遏止电压Uc与入射光频率v的关系图象如图所示.(已知电子电量e和普朗克常量h)求:
根据句意和首字母提示,完成句中所缺单词①We should brush our____ (tooth) every day.②—What’s Jane doing? —She’s b____ her sister.③ What is she doing for v____ ?④—How do you come to school? —I usually ride a b____ to school.⑤ I want to s ____ an e-mail to my aunt.