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当前学科:中级无损检测技术资格人员
题目:
单选
对于厚度变化大的物件射线照相时,为了获得较大的宽容度,需要使用线质较()的射线
A . A、硬
B . B、软
C . C、硬软都一样
D . D、与线质无关
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