题目内容

(名词解释)中央集权制

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在非阻性电路中，有功功率P、无功功率Q、视在功率S这三者之间的关系为()。

A. S=P+Q
B. S2=P2+Q2
C. Q2=S2+P2
D. S=P+Q

(名词解释)首长负责制

电流为5A,内阻为2Ω的电流源变换成一个电压源时，电压源的电动势和内阻为()。

A. 10V，2Ω
B. .5V，2Ω
C. 0.4V，2Ω
D. 4V，2Ω

Part A
Suppose you are a member of a volunteer organization As Beijing 2008 Olympic Games is drawing near, please write a letter to all volunteers to ask them to watch sports matches in a civilized manner.
You should write approximately 100 words. Do not sign your own name at the end of the letter. Use "Wang Lin" instead. You do not need to write the address.