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远古时代,中国人就开始了仰观天文、俯瞰地理的活动。春秋战国时期,又出现了百家争鸣的局面。古代中国在天文历法、地学、数学、农学、医学和人文科学的许多领域,都作出过独特的贡献。直到15世纪以前,中国的科学技术在世界上保持了千年的领先地位。这些集中体现了中华民族爱国主优良传统中( )A.
维护祖国统一，促进民族团结的精神
B.
抵御外来侵略，捍卫国家主权的精神
C.
开发祖国山河，创造中华文明的精神
D.
心系民生苦乐，推动历史进步的精神
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【多选题】What are the advantages of the smart grid?
A.
saving money
B.
increase reliability
C.
reducing the chance of power outages
D.
making the environment cleaner
E.
creating more jobs
F.
capitalizing on new technolgygies
G.
providing more services for customers
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