特点：饱和压降低，极好的直流电流增益特性好。
Features: Low VCE(sat), excellent DC current gain characteristics.
特点：直流电流增益高，放大线性好，饱和压降低。
Features: High DC current gain, excellent hFE linearity, low saturation voltage.
特点：直流电流增益高，放大线性好，饱和压降低。
Features: High DC current gain and excellent hFE linearity, low saturation voltage.
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