Which of the following statement is true about the X-ray diagnosis of tension pneumothorax？ （）

A.The diagnosis can be made if air is found in the pleural cavity

B.The diagnosis can be made when air and fluid in the pleural cavity are found

C.Timely diagnosis should be made on the basis of one chest radiograph

D.The diagnosis should be made according to the dynamic changes of chest radiograph and clinical symptoms

E.Lun compression of more than 80% is strongly indicative of tension pneumothorax

正确答案：Timely diagnosis should be made on the basis of one chest radiograph