三星级饭店紧急出口必须（）。
A.标志清楚
B.位置合理
C.无障碍物
D.有符合规范的逃生通道、安全避难场所
参考答案：A, B, C
Tony was very unhappy for to the party.[ ]
A. have not been invited
B. not having invited
C. having not invited
D. not having been invited
股静脉内见实性结构回声，管腔压之不瘪，CDFI探不到血流信号，可能的诊断是（）。
A.静脉炎性狭窄
B.静脉瘤样扩张
C.静脉的变异
D.静脉外压性狭窄
E.静脉血栓
