要想使正向导通的普通晶闸管关断，只要（）即可。
A、断开门极；
B、给门极加反向电压；
C、使通过晶闸管的电流小于维持电流
参考答案：C
— She got her first science fiction published. It turned out to be _____.
— When was that?
— It was in 2009 _____ she was still in college.[ ]
A. success; that
B. a success; when
C. success; when
D. a success; that
下列项目或行为中，应征收土地增值税的是()。
A．以房地产投资、联营，将房地产转让到所投资、联营的企业中
B．双方合作建房，建成后按比例分房自用的
C．国有土地使用权出让
D．以房地产抵债而发生房地产权属转让的
