①地狭人稠,人均资源不足 ②岛内市场狭小
③资金短缺,技术力量薄弱 ④山地多,交通运输落后
A:①②
B:②③
C:③④
D:②④
万级的数位包括:____。
- Do you know Victory Day in China?
- Yes, it's _______ September 3rd _______ each year. It tells the world that Chinese people love peace and hate wars. Chinese people will never forget the history.
在利用光具座进行凸透镜成像的实验探究中: