若方程(m-2)x2+3x=2是关于x的一元二次方程,则m的取值范围是______.
∵方程(m-2)x2+3x=2是关于x的一元二次方程,
∴m-2≠0,即m≠2.
分压式偏置放大电路如图7-47所示,已知晶体管电流放大系数β=60,UBE=0.7V,RB1=33KΩ,RB2=12kΩ,RC=3kΩ,RE=1.5kΩ,无信号时,发射极电流IE最接近于()。
A.2.7mA
B.3.2mA
C.2.1mA
D.3.8mA
It was after he went to college __ he realized the importance of forming a reading habit.
A.that
B.when
C.since
D.as