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【简答题】
科目汇总表核算形式与汇总记账凭证核算形式的适用范围是完全相同的。 （ ）
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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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