单项选择题
A.45AB.222AC.141AD.220A
A.主极T1为正,T2为负;门级电压G为正,T2为负B.主极T1为负,T2为正;门级电压G为正,T2为负C.主极T1为正,T2为负;门级电压G为负,T2为正D.主极T1为负,T2为正;门级电压G为负,T2为正
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