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【简答题】
什么是现代汽车企业的市场营销观念?
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皮皮学刷刷变学霸
举一反三
【单选题】We define : V D is the voltagebetween P terminal and N terminal, ID is the current passing through the diode,and it’s direction is from P to N. if >0 and>0, the diode is in the ( ) region
A.
0-bias
B.
forward-bias
C.
reverse-bias
D.
Zener
【单选题】A diode can be usedas a constant-voltage reference in a circuit, the diode is
A.
photodiode
B.
light-emitting diode
C.
Schottky barrier diode
D.
Zener diode
【单选题】Most modern diodes are based on semiconductor ( ). In a p-n diode, conventional current can flow from the ( ) side (the anode) to the ( ) side (the cathode), but cannot flow in the ( ) direction. ( )
A.
p-n junction, p-type, n-type, opposite
B.
p-n junction, n-type, p-type, opposite
C.
n-p junction, A-type, K-type, opposite
D.
p-n junction, A-type, K-type, opposite
【单选题】--: Glad to meet you. :______________
A.
Thank you.
B.
Glad to meet you too.
C.
That’s nice.
【单选题】A:Glad to meet you! B:——
A.
Glad to meet you too
B.
Glad to meet you to
C.
Glad nice to meet you
D.
see you
【简答题】实验室需用480mL0.2mol?L -1 的稀硫酸，现用18.4mol?L -1 的浓硫酸来配置． （1）计算所需浓硫酸的体积为______mL． （2）所需仪器除了玻璃棒、烧杯、胶头滴管、量筒外，还需要哪个仪器才能完成该实验，请写出：______． （3）实验中两次用到玻璃棒，其作用分别是：______、______． （4）下列对容量瓶及其使用方法的描述中正确的是______． A．容量瓶上...
【单选题】Light-emitting diode emit light when the p-n junction is ___________
A.
forward-biased
B.
reverse-biased
C.
zero biased
D.
operating in the Zener region
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