This article most probably appeared in
A.a government document.
B.a news magazine.
C.a scientific research paper.
D.a textbook of environmental science.
第7题
A.电灯
B. 外部灯箱
C. 监控设备
D. 总电源
为了保护您的账号安全,请在“上学吧”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!