The main reason is that the semiconductor types of each pole are different. The E, B, and C poles of PNP transistors are P-type, N-type, and P-type semiconductors, respectively, while NPN transistors are exactly the opposite.
Active and passive components
Determine gate G: Set the multimeter to the R × 1k position, connect any negative electrode of the multimeter to one electrode, and sequentially touch the other two electrodes with the other probe to measure their resistance.
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