整流是以下哪两种电能形式之间的转换？
整流是以下哪两种电能形式之间的转换？
A.AC-AC
B.AC-DC
C.DC-AC
D.DC-DC
正确答案：AC-DC
- 1.The classification of Chinese tea can be divided into six types based on the degree of fermentation, that is, green tea ,（）, Oolong tea，dark tea, white tea, and yellow tea.
- 2.As our ancestors so rightly put it, “Firewood, rice, oil, salt,（）,（）and（）begin a day.”(请按答案首字母先后顺序填写，每个答案之间空一格，不加标点符号）
- 3.The Classic of Tea written by（）is an early work on tea, summarizing all knowledge of tea in China up to that date.
- 4.As is recorded in Shen Nung’s Herbal Pharmacopeia《神农本草经》, during the early Chou dynasty, tea in China was used mainly as（）.
- 5.People often beautify their homes with paper cuttings on（）.
- 6.During the process of paper cutting,（）methods are often used.
- 7.Paper cutting tools include（）.
- 8.Chinese tea culture is a blend of（）,（）and（）, the connotation of which is a cultural and etiquette phenomenon with distinct Chinese characteristics.
- 9.What are the functions of Chinese knots in Chinese history?
- 10.Ritual jade articles were used by ancient nobles as protocol vessels in such ceremonial activities as（）.