Si-Ma Tan(司马谈), father of Si-Ma Qian (司马迁), classified these “hundred schools” first()
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稳压管的稳压区是其工作在 状态()
A. 正向导通
B. 反向截止
C. 反向击穿
D. 空白
三级管工作在放大区,要求()
A. 发射结正偏,集电结正偏
B. 发射结正偏,集电结反偏
C. 发射结反偏,集电结正偏
D. 发射结反偏,集电结反偏
_is the first nation to manufacture true porcelain in the world and has been recognized as “the home of porcelain”()
A. Japan
B. France
China
D. Greece
Since the founding of the People’s Republic of China, the country has conducted ____ population censuses()
A. 4
B. 5
C. 6
D. 7