We are not allowed _____ outdoors with some other children. [ ]

A. playing

B. to be playing

C. to play

D. be playing

主动脉夹层动脉瘤可用哪几种方法确诊

A．核磁共振

B．心电图

C．心肌酶学测定

D．经胸超声心动图

E．经食管超声心动图