【判断题】8) It is in fact not very difficult to make friends with a foreigner.
【简答题】If you want to know more about EST writing, what are the references that Chapter3 Section4 provides?
【单选题】应用叠加定理时,需要把不作用的电源置零,则正确的电源置零法为( )。
【判断题】8) It is in fact not very difficult to make friends with a foreigner.