P沟道增强型IGFET的开启电压Ugs( th ))为___ (a. 正值，b.... (a. 正值，b. 负值，c. 零值)
P沟道增强型IGFET的开启电压Ugs( th ))为___ (a. 正值，b.... (a. 正值，b. 负值，c. 零值)
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P沟道增强型IGFET的开启电压Ugs( th ))为___ (a. 正值，b.... (a. 正值，b. 负值，c. 零值)