“青峰居士”是南唐哪位词人的称号？
参考答案：“青峰居士”是李煜的称号。
The headmaster wants to have the opening speech ________ by our math teacher next month.
A．deliver
B．to deliver
C．delivered
D．delivering
A．减小波源的频率
B．增大波源的频率
C．将N板向左移
D．将N板向右移
