题目

如图（a）所示电路中，当闭合开关后，两只电压表的指针偏转均如图（b）所示，则电阻R1和R2两端的电压分别为（ ） A．7.5V   1.5V     B．6V    1.5V C．1.5V   7.5V     D．1.5V    6V 答案：BThe dinner party was a success, but we thought it was a pity not ________you.A．invite B．to invite C．inviting D．to have invited