食管癌恶性程度最高的是（）
A.髓质型
B.溃疡型
C.浸润型
D.蕈伞型
E.腔内型
参考答案：A
消化性溃疡的深浅不定，通常深达（）
A.黏膜层
B.黏膜下层
C.肌层
D.浆膜层
E.超出浆膜层
Which of the following is most representative of forward contracts and contingent claimsForward Contracts Contingent Claims（）
A. Premium paid at inception Premium paid at inception
B. Premium paid at inception No premium paid at inception
C. No premium paid at inception Premium paid at inception
