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【单选题】
若测得工作在放大电路中的某一个双极型晶体管( BJT )的 3 个电极的 直流电位为 : U 1 = 11.7 V , U 2 = 6 V , U 3 = 12 V ,据此判断该A.
PNP 型 Ge 管
B.
PNP 型 Si 管
C.
NPN 型 Si 管
D.
NPN 型 Ge 管
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举一反三
【简答题】粉底的作用( )( )
【单选题】The Virus Hunters The mouth of the Amazon River has long been a starting place for hunters going to the jungles of Brazil. In recent years it has been, too, the headquarters for a middle-aged American...
A.
new viruses have just been discovered
B.
his discovery was a bit frightening
C.
he and his wife were surrounded by harmful viruses
D.
his job was exciting
【单选题】What does the writer imply according to the passage?
A.
Male elephants are hunted more than female elephants.
B.
Both male elephants and female elephants are equally hunted.
C.
Each elephant has a long life.
D.
There are not any ivory hunters in the world now.
【简答题】粉底的作用？
【简答题】The reasons that elephants are being hunted.
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