当我们计算放大电路的静态工作点时，必须按（）来考虑。
A.直流通路
B.交流通路
C.A和B都对
D.没有电流
参考答案：A
My son __________ his clock when I went to get a cup I __________ in his study.
A．was winding up; had left
B．would up; had forgotten
C．had wounded; left
D．was winding up; forgot
下列给出的赋值语句正确的是（ ）
A．1=x
B．x=2x
C．a=b=2
D．x+y=0
