单项选择题
A.0.1 B.0.15 C.0.18 D.0.21
A.输出电压的β倍 B.等于电源电压 C.40V D.60V
A.1.5V~2.8V B.1.6V C.1.6V~28.1V D.28V
A.0.5V B.0.6V C.1V D.1.5V
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