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一、利用滑动变阻器保护电表不超过量程(或不损坏),求其取值范围此类计算题用数学中的不等式求解,比较简单.例1如图1所示,
First, the use of sliding rheostat to protect the meter does not exceed the range (or not damaged), seeking its range of values such calculations using mathematical inequalities to solve, relatively simple. Example 1 as shown in Figure 1,