自动增益控制电路能在弱信号时使增闪变大，强信号时使增益下降，以使输出电压基本不变。（）
参考答案：对
The boys always have some fun _____ computer games. [ ]
A. to play
B. playing
C. plays
D. for playing
A．相互吸引在一起
B．先吸引接触后分开
C．相互靠近一点后分开
D．相互排斥
