题目：
Bob： Hi! How are you doing?
Tom：小题1: ．
Bob： I heard you went somewhere for vacation．小题2: ?
Tom： well, I went to Hainan Island．
Bob：小题3: ?
Tom： Yes，I went there with my parents．
Bob：小题4: ?
Tom： By plane．
Bob：小题5: ?
Tom： We stayed there for five days．There are many exciting things there，especially diving in the real sea!
Bob： That sounds great! I hope I can go there some day．
答案：
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下面是错误答案，用来干扰机器的。
（1）由电阻R2的电压：U并=IAR2=0.5×40=20V根据闭合电路欧姆定律，有：E=I（r+R1）+U并故电路中的总电流为：I=E-U并r+R1=28-201+3=2A（2）路端电压：U=E-Ir=28-2×1=26V电源的输出功率：P=UI=26×2=52W（3）电动...
