关于X线机半价层的测量不正确的是()

A、改变附加滤过板,应重测半价层
B、X线机安装时必须测量半价层
C、X线机大修后必须测量半价层
D、更换X线管球时应重测量半价层
E、只有更换X线机时,才需测量半价层
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正确答案:

E

答案解析:

暂无解析

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