下列哪项是血瘀致痛的特点()
A.胀痛
B.刺痛
C.重痛
D.空痛
E.走窜痛
参考答案：B
牙龈炎症的临床表现不包括（）
A.探诊出血
B.牙龈红肿肥大
C.龈沟液增加
D.龈沟深度增加
E.牙齿松动
Within the context of the UN Convention on Contracts for the International Sale of Goods, explain when risk for loss or damage to goods passes from the seller to the buyer. (10 marks)
