作为集电极调幅用的高频谐振功率放大器，其工作状态应选用（）
A.甲类
B.临界
C.过压
D.欠压
参考答案：C
The incident turned him into different person, even if he did not realize it at beginning.
A．a; a
B．the; the
C．the; a
D．a; the
6 24 10 20 14 16________ 12()
A．14B．16C．10D．18
