腹主动脉瘤的临床表现包括()
A.腹部搏动性包块
B.腹部或腰背部疼痛
C.尿路梗阻表现
D.下肢动脉栓塞
E.大量出血
参考答案:A, B, C, D, E
钨极氩弧焊时,高频振荡器的作用是引弧和稳弧,因此在焊接过程中始终工作。( )
---I’m very sorry to have ___ you with so many questions.
---It doesn’t matter.
A.forbidden
B.excused
C.impressed
D.bothered