溃疡深大,呈菜花状,基底及边缘硬有浸润,疼痛不明显的是
A.结核性溃疡B.创伤性溃疡C.癌性溃疡D.腺周口疮E.梅毒下疳
参考答案:C
– Mike, I won the first prize in the speech contest last week.
-- ___!
A.Congratulations
B.Enjoy yourself
C.Good luck
D.No way.
过滤罐为什么要进行反冲?