The external logistics is connected the macro economic activities like（）.

A．international trading

B．international commerce

C．global OEM

D．global investment in manufacture

胸骨后疝（）

A.腹部脏器自胸腹裂孔缺损疝人胸腔

B.腹部脏器自胸骨旁缺损疝入胸腔

C.腹部闭合性损伤，腹腔脏器经膈肌破裂处疝入胸腔

D.贲门和胃底经膈食管裂孔疝入纵隔

E.膈肌发育薄弱，腹腔脏器向胸腔膨出