The passage you are reading is the beginning part of a report in the original. Then, what is "This", the first word, most probably referring to

A．An offered illustration.

B．Part of a textbook on politics.

C．What the author is going to write.

D．The principle that voters are shrewder than' most politicians believe.

3311E运矿汽车的ECU供电电压为12伏，电压高损坏ECU。