【单选题】During the 19th century, Jews in most European countries achieved some equality of status with non-Jews. Nonetheless, at times Jews were harassed by anti-Semitic groups.
【简答题】在如图所示的振荡电路中, C 1 = C 2 = 500pF , C = 50pF , L = 1mH ,问: (1) 该电路属于何种类型的振荡电路? (2) 计算振荡频率 f 0 ; (3) 若 C 1 = C 2 = 600pF ,此时振荡频率 f 0 又为多少?从两次计算的频率中能得出什么结论?