题目内容：
下列关于对比剂的说法哪个是正确的（）Which of the following statements about contrast medium is true（）
A.对比剂的作用是形成浓黑的胶片影像The role of contrast agent is to form a thick black film image
B.对比剂的作用是形成淡白的胶片影像The role of contrast agent is to form a light white film image
C.对比剂可以增大待检查组织周围器官的密度差Contrast agent can increase the density difference of organs around the tissue to be examined
D.对比剂不影响待检查部位与周围器官的密度差Contrast agent do not affect the density difference between the part to be examined and the surrounding organs
参考答案：