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【简答题】
如图(见教材)所示放大电路的参数为: RB1=12K Ω , RB2=3.9K Ω , RC=RL=2.7K Ω , RE=2K Ω , Ucc=12V , UBE=0.7V ,晶体管β =50 ,求静态工作点、输入电阻、输出电阻、电压放大倍数。说明稳定工作点的过程
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【单选题】The children put on ___ one-act play last Saturday. ___ play amused everyone of us.
A.
the… the
B.
/…the
C.
the…/
D.
/…/
【简答题】关关雎鸠，__________。窈窕淑女，__________。（《诗经?关雎》）
【单选题】We must try our best to the river being polluted any more.
A.
separate
B.
keep
C.
prevent
D.
guard
【单选题】To take social responsibility, a business should ______.
A.
help solve social problems
B.
play a part in improving the quality of life in the community
C.
protect the environment
D.
all of above
【单选题】Is prosecution likely to be (a) the act of accusing someone of a crime, or (b) the process of supervision by the social services?
A.
the act of accusing someone of a crime
B.
the process of supervision by the social services
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