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【多选题】
三极管具有放大作用外部电压条件是件( )。
A.
发射结正偏
B.
发射结不偏
C.
集电结不偏
D.
集电结反偏
E.
集射结正偏
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【多选题】一下适合包膜的种子是()
A.
玉米
B.
南瓜
C.
西瓜
D.
三色堇
【单选题】Which statement is not true?
A.
The stories of Harry Potter are criticized in some other cities in U.S except New Mexico.
B.
Young people are fascinated with Harry Potter.
C.
Christian churches hate Harry Potter.
D.
Pastor Jack Brock planned to burn the Harry Potter books on Sunday.
【单选题】中国最早出现的带有教育性质的养老机构被称为 ()A. 庠 B.序 C.校 D.辟雍
A.
A
B.
B
C.
C
D.
D
【简答题】排入大气的污染物种类很多,依照污染物的来源可分为 污染源、 染源、 污染源、 污染源。根据污染物存在的形态,可分为 污染物和 污染物。
【单选题】某功率放大器的静态工作点 Q 在交流负载线的中点附近,由此可以判断该功率放大器的类型是
A.
甲类功率放大器
B.
乙类功率放大器
C.
甲乙类功率放大器
D.
丙类功率放大器
【单选题】Which Midwestern city is the automobile capital of the world?
A.
Chicago
B.
Detroit
C.
Milwaukee
D.
Cleveland
【单选题】According to the last paragraph, which of the following statements is NOT true?
A.
Other cities hope they can also conserve power.
B.
Other cities hope they can use superconducting cables soon.
C.
Superconductors waste less power because of their low resistance.
D.
The Frisbie experiment is not successful.
【单选题】Which Midwestern city of the USA is the automobile capital of the world?
A.
Chicago.
B.
Detroit.
C.
Milwaukee.
D.
Cleveland.
【单选题】Shenzhen has passed a new law to ban smoking in public, which canthecivilization of a city.
A.
weigh
B.
balance
C.
explore
D.
measure
【单选题】某功率放大器的静态工作点 Q 在交流负载线的截止点,由此可以判断该功率放大器的类型是
A.
甲类功率放大器
B.
乙类功率放大器
C.
甲乙类功率放大器
D.
丙类功率放大器
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