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【单选题】
上图为X线管灯丝加热电路,B11为稳压器,B4、B3分别为大、小焦点灯丝变压器;B10为空间电荷抵偿变压器;R3、R6为透视管电流调节电阻,R7、R8为摄影管电流调节电阻,XK1为摄影管电流选择器。下列电路分析,错误的是( )
A.
透视时，JC2和JC4都不工作，则其工作电路为： B3→DZ7-F1→R7→R6→R3→JC2（常闭）→JC4（常闭）→B11（公） B3→DZ7-F0→DZ2-3→B11（出）
B.
点片摄影准备电路  XK1置于所需毫安档，拉动点片手柄，JC4工作，则其工作电路为： B11（出）→DZ2-3→DZ7-F0→B4→DZ7-F2→R8→XK1-300→B10→JC4（）→B11（公）
C.
小焦点摄影电路   XK1置于30mA档，按下手开关，透视与摄影交换接触器JC2工作，则其工作电路为： B11（出）→DZ2-3→DZ7-F0→B3→DZ7-F1→R7→XK1-300的30mA档→B10→JC2（）→B11（公）
D.
大焦点摄影电路   XK1置于50mA～200mA任一档，按下手开关，JC2工作，则其工作电路为： B11（出）→DZ2-3→DZ7-F0→B4→DZ7-F2→R8（50mA～200mA）→XK1-300→B10→JC2（）→B11（公）
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