如图15-44所示电路,已知U CC =20V,R B =120kΩ,R E =R L =3.6kΩ,β=100,静态时U CE =5.5V,R S =3kΩ(1)试求r i ,A u ,r o ;(2)若R S =300Ω,求输出电阻r o ;(3)若R S =30kΩ,求r 0 ;(4)将(1),(2),(3)的计算结果作比较,说明射极输出器特点。
【单选题】Your vessel is equipped with a fixed CO 2 system and a fire main system. In the event of an electrical fire in the engine room what is the correct procedure for fighting the fire?()
A.
Use the CO 2 system and evacuate the engine room
B.
Use the fire main system and evacuate the engine room
C.
Evacuate the engine room and use the CO 2 system
D.
Evacuate the engine room and use the fire main system