病人，男性，30岁，身高2.04m，在体育训练中突然发作后背剧烈疼痛，疼痛为刀割样，难以忍受。病人大汗淋漓，血压20/15kPa(150/113mmHg)。心电图检查无明显异常发现。核磁共振检查见胸主动脉严重扩张，直径达7.5cm。问：①该患者的诊断是什么?②其治疗原则如何?

A. 正确
B. 错误

A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line.
B. A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line.
C. A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line.
D. A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line.

A. 孔板开孔圆柱部分生锈
B. 温度计不准，记录的温度比实际偏小
C. 计算用的相对密度G，比实际相对密度偏小
D. 孔板孔径尺寸量错，计算用的孔径比实际孔径大

A. 正确
B. 错误