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【单选题】
小功率场效应晶体管在使用中,其源极和漏极可以互换,电路中如何判断场效应管的漏极和源极?
A.
N沟道管，电位高的端是源极
B.
N沟道管，电位高的端是漏极
C.
P沟道管，电位低的端是源极
D.
P沟道管，电位高的端是漏极
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