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有一均匀的半圆形合金片(如图1所示),将AB接入电路,测得电阻为R,若将CD接入电路,那么电阻RCD是多大?
There is a uniform semi-circular alloy piece (as shown in Figure 1). Connect the AB to the circuit and measure the resistance as R. If the CD is connected to the circuit, then what is the resistance RCD?