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【单选题】
有关旋转阳极X线管的短时使用最大容许功率的叙述,哪组是错误的?A.
如果在1秒以下的负荷时间内,把阳极旋转速度增加2倍,其短时使用功率可增大1.7倍
B.
如果把管电压提高2倍,管电流被限制在1/2倍
C.
普通转速阳极X线单相全波整流时,1次照射与2次照射的短时使用功率没有变化
D.
如果把照射时间缩短1/2,即可容许2倍的管电流通过
E.
以上都正确
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