X线通过物质时强度减弱，其衰减符合（）When X-rays travel through a materail, what is the law of its attenuation?（）

X线通过物质时强度减弱，其衰减符合（）When X-rays travel through a materail, what is the law of its attenuation?（）
A.线性衰减规律Linear decreasing
B.线性增长规律Linear increasing
C.指数增长规律Exponential incresing
D.指数衰减规律Exponential decresing
正确答案：指数衰减规律Exponential decresing