【判断题】N型半导体中,自由电子是多数载流子,空穴是少数载流子。
【简答题】Match the company terms with their definitions
【单选题】Lack of money led the company to a situation _____ they had to decide whether they should keep on with their production.
【简答题】在△ABC中,已知A、B、C成等差数列,求tg( A 2 )+ 3 tg( A 2 )tg( C 2 )+tg( C 2 )的值.
【判断题】N 型半导体中空穴是多数载子,自由电子是少数载流子。