单项选择题
A.14A B.1.98A C.1A D.0.99A
A.16.2A B.1.15A C.1.62A D.2.29A
A.314Hz B.311Hz C.50Hz D.100Hz
A.管脚A为基极，管脚B为发射极，管脚C为集电极 B.管脚A为集电极，管B为发射极，管即C为基极 C.管脚A为集电极，管脚B为基极，管脚C为发射极 D.管即A为发射极，管脚B为集电极，管脚C为基极
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