单相全控桥电阻性负载电路中，晶闸管可能承受的最大正向电压为(  )

A、<span lang="EN-US" style="FONT-FAMILY: "><IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/1024de98-a876-40d2-b24d-77bfa9edb6f9.gif"title="ex_1275469509746_0.gif" alt="ex_1275469509746_0.gif"/>U2</span>

B、<span lang="EN-US" style="FONT-FAMILY: ">2<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/eab8b378-0768-40cb-890e-70dd7ca05a98.gif"title="ex_1275469536649_0.gif" alt="ex_1275469536649_0.gif"/>U2</span>

C、<span lang="EN-US" style="FONT-FAMILY: "><IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/ba580cae-1e7e-4e8a-9395-4336f806f060.gif"title="ex_1275469551501_0.gif" alt="ex_1275469551501_0.gif"/><IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/df646408-907a-4fad-a1fd-c277e31e6edc.gif"title="ex_1275469565619_0.gif" alt="ex_1275469565619_0.gif"/>U2</span>

D、<span lang="EN-US" style="FONT-FAMILY: "><IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/05bba672-7aed-461d-88bc-9d3597014f24.gif"title="ex_1275469669119_0.gif" alt="ex_1275469669119_0.gif"/>U2</span>