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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
【单选题】People have always____about exactly how life on earth began. [ ]
A.
curious
B.
excited
C.
anxious
D.
careful
【单选题】People have always been curious _____ how living things on the earth exactly began. [ ]
A.
in
B.
at
C.
of
D.
about
【单选题】“ 人闲桂花落,夜静春山空。月出惊山鸟,时鸣春涧中。”这首诗体现了
A.
事物的运动是绝对的
B.
静止是一种特殊的运动
C.
运动和静止是统一的
D.
物质是运动的存在方式
【单选题】People have always been____ about exactly how life on earth began. [ ]
A.
curious
B.
excited
C.
anxious
D.
careful
【单选题】—Guess what? I happened to have met Mark at the party last week. —If my memory serves me correctly, you two ______ each other for almost ten years. [ ]
A.
hadn't seen
B.
haven't seen
C.
didn't see
D.
don't see
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