大战略中的领导体现了历史的偶然性和不可复制性。()
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awardwelfaremoldassembleannualenduranceconvinceemphasizeThey met at an _____ convention in New York.1.It is a harsh test of _____ for the athletes.She should be able to _____ you of stupid decision andfuture consequences.4.The ____ crowd assumed him was there to observe the race.5.They were uneasy and very concerned for his _____.6.The film won an Oscar _____ for 1985.
在放大电路中,若测得晶体管三个极的电位分别为9V,4V,3.4V,则该管为( )
A. NPN型硅管
B. NPN型锗管
C. PNP型硅管
D. PNP型锗管
工作在放大区的某三极管,如果当IB从12μA增大到25μA时,IC从1mA变为2mA,那么它的β约为。
A. 77
B. 91
C. 100
在放大电路中,若测得晶体管三个极的电位分别为9V,3.6V,3.4V,则该管为( )
A. NPN型硅管
B. NPN型锗管
C. PNP型硅管
D. PNP型锗管