变阻器在电路中起着“牵一发而动全身”的作用.分析动态电路时,同学们的思维往往停留在两个极端,而忽略了中间过程,使解题偏离方向.为此,本文以一道高考题为例,加以引申,帮助大家了解这类题的分祈过程. The varistor plays a role in the circuit as a result of “moving the whole body.” When analyzing the dynamic circuit, the students’ thinking tends to stay at the two extremes while ignoring the intermediate process and making the problem deviate from the direction. For this reason, An example of the college entrance examination question is to be extended to help you understand the process of division and prayer of such questions.