直肠息肉是指直肠内哪项上的赘生物:()
A.粘膜
B.肌层
C.固有层
D.以上均是
E.以上均非
参考答案:A
The collecting bank may release the documents against the buyer’s acceptance of a sight draft on documents against acceptance basis. ()
简述翡翠的豆--粒状特征