【简答题】称为“娇脏”的是( )。A.心B.肝C.脾D.肺A. 1 B. 1 C. 1 D. 1
【简答题】在图15.25所示的分压式偏置放大电路中,已知U CC =15V,R C =3kΩ,R E =2kΩ,I C =1.55mA,β=50,试估算R B1 和R B2 (取附录H标称值)。
【单选题】According to the interviewee, how do bacteria develop resistance?
A.
Some bacteria are so strong that drugs can't get into the cells.
B.
Some bacteria are able to drive the drugs out of their cells.
C.
Some bacteria are able to hide behind other ones.
D.
Some bacteria can reproduce before they are killed by drugs.
【单选题】按正态分布规律,测量值 x 出现在μ ≤ x ≤ μ+σ区间的概率是
【单选题】在图2-1中,UCC=12V,RC=3KΩ,β=50,UBE可忽略,若使IC=1.5mA,则RB应为( )。