If a specimen were radiographed at 40KV and again at 50KV with time compensation to give the radiographs the same ednsity, which of the following statements would be true?

• 一个试样用40KV进行射线照相，如果用50KV曝光，可通过时间补偿获得密度相同的射线。在这种情况下，下列哪种说法是正确的？